Notes front door: format-agnostic import into the graph pipeline

The same extractor→auditor→merger pipeline now runs over raw personal
notes in arbitrary formats (vision §1, DECIDED 2026-09-13):

- NotesSource records (data/graph/sources.json, deterministic id from
  path hash → idempotent re-imports) play the chatId role in mappings,
  checkpoints, and observation events; usage lands on the source record
  (appendSourceUsage, idempotent per startedAt, kept across upserts).
- mergeFindings is chat-store-free: callers pass MergeSource
  {messages, foldedAt} — sessions pass the chat record, notes pass
  messages:null (no quiz-event rebuild; a deterministic rebuild needs
  structured quiz tool parts).
- Second extractor prompt (NOTES_EXTRACTOR_INSTRUCTIONS) for general-
  purpose extraction; understanding judges the AUTHOR's grasp. Auditor
  wording input-agnostic. extract/audit share one generic runSubmitAgent.
- graphSnapshot.fileSources (srcId→filePath); notes sources render as
  static path entries in the detail card (FileTextIcon, never a link).
- One shared pipeline instance (exported from chat-handler): same
  single-flight registry, live status chips (label = file path), usage
  accounting, and true abort for both front doors.
- Transport: POST /api/graph/import (multipart, 3-wide worker pool) +
  Import notes… button in the graph view; scripts/import-notes.ts for
  batch runs (concurrency 4).
- real-data-extraction/ gitignored (raw import sources never committed).

355/355 tests; typecheck, lint, build green.

.gitignore

@@ -7,3 +7,5 @@ data/
 .env.local
 .memory/
 SCOPE.md
+# raw real-data import sources (user directive 2026-09-13: never commit)
+real-data-extraction/

app/api/graph/import/route.ts

@@ -0,0 +1,52 @@
+/**
+ * POST /api/graph/import — the format-agnostic front door's transport
+ * (vision §1, 2026-09-13): raw personal-notes files in, one extraction run
+ * per file through the SAME pipeline the sessions use. Multipart form data
+ * (field "files", any text format — the extractor is format-agnostic); the
+ * pipeline mints a deterministic source id per file path, persists the
+ * source record (the file's provenance + the run's usage), and runs
+ * extractor → auditor → merger over the raw text.
+ *
+ * Small concurrency cap: the model calls are the slow part, and a burst of
+ * 25 simultaneous runs would trip provider rate limits — a 3-wide worker
+ * pool keeps the run registry (the dock's status chips) and the ledgers
+ * healthy. The dock's chips + graph refetch track progress live through
+ * /api/graph/status, as with session runs.
+ */
+import { extraction } from "@/src/server";
+import type { EmissionStats } from "@/src/core";
+
+export const dynamic = "force-dynamic";
+
+interface ImportResult {
+	filePath: string;
+	ok: boolean;
+	stats?: EmissionStats;
+	error?: string;
+}
+
+export async function POST(request: Request) {
+	const form = await request.formData();
+	const files = form.getAll("files").filter((f): f is File => f instanceof File);
+	if (files.length === 0) {
+		return Response.json({ results: [] as ImportResult[], error: "no files" }, { status: 400 });
+	}
+
+	const results: ImportResult[] = [];
+	const queue = [...files];
+	const workers = Array.from({ length: Math.min(3, files.length) }, async () => {
+		for (;;) {
+			const file = queue.shift();
+			if (!file) return;
+			try {
+				const text = await file.text();
+				const stats = await extraction.importNotes({ filePath: file.name, text });
+				results.push({ filePath: file.name, ok: true, stats });
+			} catch (err) {
+				results.push({ filePath: file.name, ok: false, error: err instanceof Error ? err.message : String(err) });
+			}
+		}
+	});
+	await Promise.all(workers);
+	return Response.json({ results });
+}

app/api/graph/status/route.ts

@@ -12,7 +12,9 @@ export const dynamic = "force-dynamic";
 export async function GET() {
 	const runs = extractionStatuses().map((run) => ({
 		chatId: run.chatId,
-		title: chatStore.getChat(run.chatId)?.title ?? run.chatId,
+		// The run's own label (the file path for notes imports) wins; chat
+		// runs fall back to the chat store's title.
+		title: run.label ?? chatStore.getChat(run.chatId)?.title ?? run.chatId,
 		phase: run.phase,
 		startedAt: run.startedAt,
 		// Live per-stage usage (the money channel): model + per-step CallUsage,

components/graph-view.tsx

@@ -56,7 +56,7 @@
 
 import { useEffect, useLayoutEffect, useMemo, useRef, useState } from "react";
 import Link from "next/link";
-import { Loader2Icon, SearchIcon, WaypointsIcon } from "lucide-react";
+import { FileTextIcon, Loader2Icon, SearchIcon, UploadIcon, WaypointsIcon } from "lucide-react";
 import Graph from "graphology";
 import forceAtlas2 from "graphology-layout-forceatlas2";
 import type { NodeHoverDrawingFunction, NodeLabelDrawingFunction } from "sigma/rendering";
@@ -322,7 +322,9 @@ function tokenHex(cssVar: string): string {
 
 interface Selection {
 	node: GraphNode;
-	chatIds: string[];
+	/** The sources that touched this node: chat ids (deep-linkable sessions)
+	 *  and notes-source ids ("src_…" — imported files, static entries). */
+	sourceIds: string[];
 	/** Node position in container pixels (from graphToViewport at click time). */
 	anchor: { x: number; y: number };
 }
@@ -368,6 +370,26 @@ export function GraphView() {
 		};
 	}, [refreshTick]);
 
+	// Notes import (the format-agnostic front door): file picker → POST
+	// /api/graph/import; the runs surface in the status chips below, and the
+	// graph refetches when they finish (the runs-empty transition).
+	const fileInputRef = useRef<HTMLInputElement>(null);
+	const [importing, setImporting] = useState(false);
+	const onImportFiles = (files: FileList | null) => {
+		if (!files || files.length === 0) return;
+		setImporting(true);
+		const form = new FormData();
+		for (const file of Array.from(files)) form.append("files", file);
+		fetch("/api/graph/import", { method: "POST", body: form })
+			.then(async (res) => {
+				const body = (await res.json()) as { results: { filePath: string; ok: boolean }[] };
+				const failed = body.results.filter((r) => !r.ok);
+				if (failed.length > 0) console.error("notes import failed for:", failed);
+			})
+			.catch((err) => console.error("import failed:", err))
+			.finally(() => setImporting(false));
+	};
+
 	// Background pipeline status: poll /api/graph/status; when a run
 	// finishes (some -> none), refetch the graph.
 	const [pipelineRuns, setPipelineRuns] = useState<{ chatId: string; title: string; phase: string; startedAt: number }[]>([]);
@@ -490,7 +512,7 @@ export function GraphView() {
 					const anchor = renderer?.graphToViewport({ x: pos.x ?? 0, y: pos.y ?? 0 });
 					setSelected({
 						node: graphNode,
-						chatIds: snapshot.nodeSessions[node] ?? [],
+						sourceIds: snapshot.nodeSessions[node] ?? [],
 						anchor: anchor ?? { x: 0, y: 0 },
 					});
 				});
@@ -640,6 +662,28 @@ export function GraphView() {
 							No matching nodes.
 						</div>
 					)}
+					<div className="mt-1.5 border-t pt-1.5">
+						<input
+							ref={fileInputRef}
+							type="file"
+							multiple
+							accept=".md,.markdown,.txt"
+							className="hidden"
+							onChange={(e) => {
+								onImportFiles(e.target.files);
+								e.target.value = ""; // allow re-picking the same file
+							}}
+						/>
+						<button
+							type="button"
+							disabled={importing}
+							onClick={() => fileInputRef.current?.click()}
+							className="flex h-7 w-full items-center justify-center gap-1.5 rounded-lg border text-xs text-muted-foreground transition-colors hover:bg-accent disabled:opacity-50"
+						>
+							<UploadIcon className="size-3" />
+							{importing ? "Importing…" : "Import notes…"}
+						</button>
+					</div>
 				</div>
 			)}
 
@@ -670,20 +714,38 @@ export function GraphView() {
 				>
 					<div className="text-sm font-medium leading-snug">{selected.node.name}</div>
 					<div className="mt-1 text-xs leading-relaxed text-muted-foreground">{selected.node.statement}</div>
-					{selected.chatIds.length > 0 ? (
+					{selected.sourceIds.length > 0 ? (
 						<div className="mt-3 flex flex-col gap-1">
 							<div className="text-xs text-muted-foreground">Sessions</div>
-							{selected.chatIds.map((chatId) => {
-								// That session's understanding observation — the
+							{selected.sourceIds.map((sourceId) => {
+								// That source's understanding observation — the
 								// extractor's named-word note (confidence history).
-								const note = snapshot?.nodeObservations?.[selected.node.id]?.[chatId];
+								const note = snapshot?.nodeObservations?.[selected.node.id]?.[sourceId];
+								// An imported-notes file: a STATIC entry — the path,
+								// plain text, never a link (no session to open).
+								if (snapshot?.fileSources?.[sourceId] !== undefined) {
+									return (
+										<div key={sourceId} className="flex items-center gap-1.5">
+											<FileTextIcon className="size-3.5 shrink-0 text-muted-foreground" />
+											<span className="min-w-0 flex-1 truncate px-1 py-1 text-sm text-muted-foreground">
+												{snapshot.fileSources[sourceId]}
+											</span>
+											{note && (
+												<span className="max-w-28 shrink-0 truncate whitespace-nowrap rounded-full border px-2 py-0.5 text-[10px] text-muted-foreground">
+													{note}
+												</span>
+											)}
+										</div>
+									);
+								}
+								// A real session: deep-linkable provenance.
 								return (
-									<div key={chatId} className="flex items-center gap-1.5">
+									<div key={sourceId} className="flex items-center gap-1.5">
 										<Link
-											href={`/chat/${chatId}`}
+											href={`/chat/${sourceId}`}
 											className="min-w-0 flex-1 truncate rounded-md px-2 py-1 text-sm text-foreground transition-colors hover:bg-accent"
 										>
-											{snapshot?.sessions[chatId] ?? chatId}
+											{snapshot?.sessions[sourceId] ?? sourceId}
 										</Link>
 										{/* The note is a fixed-scale word (solid/shaky/...) — the
 										    session name is the main thing; the chip is bounded so

config.ts

@@ -72,3 +72,10 @@ export const LEDGER_FILES = {
 	mappings: path.join(PATHS.graph, "mappings.jsonl"),
 	sessions: path.join(PATHS.graph, "sessions.jsonl"),
 } as const;
+
+/**
+ * Notes-import bookkeeping (NOT a ledger): one JSON map, src-id → NotesSource
+ * record (contracts/graph.ts) — the file path + import time + the run's usage
+ * log. Read-modify-write like a chat file, not append-only like the ledgers.
+ */
+export const SOURCES_FILE = path.join(PATHS.graph, "sources.json");

docs/vision.md

@@ -43,12 +43,37 @@ Every node records every **(chat, message) point** where it came up; every edge
 
 Three stages, one pipeline — the sole graph writer:
 
-- **Extractor (LLM) — session-only scope.** Sees ONLY the session transcript (tree-blind, with message ids). Reports freely, with verbatim evidence: propositions from anywhere in the session (one reasoning step each; prose counts as much as anything the teacher formalized), edges as the transcript articulates them, message-granular provenance, retroactive quiz attribution, and per proposition an **understanding level** — how strongly the learner accepted/understood it in this session, a CLOSED named-word scale (`solid` / `shaky` / `accepted` / `resisted` / `not yet engaged`; 2026-09-08: schema-enforced — exactly one word, no numbers, no justifications, which are dropped rather than stored). The levels are data for the future state model; their treatment is TBD.
+- **Extractor (LLM) — single-source scope.** Sees ONLY the source text — a session transcript (tree-blind, with message ids) or raw notes (the front door's second prompt, above). Reports freely, with verbatim evidence: propositions from anywhere in the session (one reasoning step each; prose counts as much as anything the teacher formalized), edges as the transcript articulates them, message-granular provenance, retroactive quiz attribution, and per proposition an **understanding level** — how strongly the learner accepted/understood it in this session, a CLOSED named-word scale (`solid` / `shaky` / `accepted` / `resisted` / `not yet engaged`; 2026-09-08: schema-enforced — exactly one word, no numbers, no justifications, which are dropped rather than stored). The levels are data for the future state model; their treatment is TBD.
 - **Auditor (LLM) — the global-graph scope.** Sees the extractor's output AND the existing graph. Two jobs: the faithfulness net (every candidate verified against verbatim evidence — unchanged), and the **identity judgment**: link each proposition to an existing node (recording the session's phrasing as an alias) or create it new. Conservative: duplicates over wrong merges.
 - **Merger (deterministic).** Append-only ledger writes; quiz event kinds/refs rebuilt mechanically from quiz tool parts. Every judgment is an LLM's; everything mechanical stays code.
 
 **Event ledger (amended):** quiz outcomes are rebuilt deterministically from quiz tool parts (correct / miss / don't-know, plus the learner's note). **There is no `taught` event** — no marking-things-done. The extractor's per-proposition understanding levels join the ledger as session-scoped observations (one closed-scale word per node per session). Identity is no longer exact-string matching — it is the auditor's judgment, with aliases as the phrasing record.
 
+### The format-agnostic front door — notes imports (DECIDED 2026-09-13)
+
+The same three-stage pipeline (extractor → auditor → merger) runs over **raw
+personal notes in arbitrary formats** — an Obsidian vault, plain markdown,
+anything textual. The extractor is format-blind by construction (it always
+saw rendered text, never ChatRecord JSON), so the notes path needs only a
+second extractor prompt (general-purpose extraction; the understanding word
+judges the **author's** grasp from their own commentary) and a source
+abstraction: each imported file becomes a `NotesSource` record (deterministic
+id from the path hash — re-imports are idempotent), playing the `chatId` role
+in mappings, checkpoints, and observation events.
+
+Decided edges:
+
+- **No session shaping.** Notes are never bent into teacher/learner
+  transcripts; quiz outcomes inside notes surface only via the extractor's
+  understanding observations (the deterministic quiz-event rebuild is a
+  session-pipeline feature — it needs structured quiz tool parts).
+- **Static provenance.** Imported nodes show the file path in the sessions
+  list as a static entry — never a link. Understanding-assessment levels
+  apply to personal notes as to sessions.
+- **Same single-flight registry and observability** as session runs: live
+  status, usage accounting per stage, true abort. One pipeline instance,
+  two front doors (quiz-triggered sessions; POST /api/graph/import).
+
 ### Understanding is derived (amended 2026-09-02)
 
 Known vs. understood, event ledger as source of truth, derived state recomputed on read — carried over from the design doc in spirit. The state model itself is now an explicit design discussion: **node states should be session-independent and computed from the depth and strength of dependencies** (the `follows`/`supports` topology) plus quiz events and understanding notes. That redesign is pending ideation; the transitional five-class derivation (taught / known / missed / don't-know / candidate) was **removed** (2026-09-08) — the graph view renders state-neutral nodes until the state model is designed. The anchored calibration rubric stays parked until real data.

scripts/import-notes.ts

@@ -0,0 +1,62 @@
+/**
+ * Import raw notes files through the format-agnostic front door (vision §1,
+ * 2026-09-13) — every *.md / *.txt file in a directory becomes one
+ * extraction run (extractor → auditor → merger) over its raw text. Run
+ * from this worktree only — data never crosses trees:
+ *
+ *   npx tsx --env-file=.env.local scripts/import-notes.ts <dir> [concurrency]
+ *
+ * Default dir: real-data-extraction/learn-sessions (the prototype
+ * learning-session exports — deliberately NOT imported as chats: they run
+ * through the notes path, raw). Runs in this process: the dev server's
+ * status chips do NOT see them (registry is per-process) — the dev server
+ * sees runs triggered through /api/graph/import.
+ */
+import * as fs from "node:fs";
+import * as path from "node:path";
+import { createExtractionPipeline } from "../src/agent/subagents/extraction.ts";
+import { getGraph } from "../src/core/graph.ts";
+import { stores } from "../src/server/stores.ts";
+
+async function main() {
+	const dir = process.argv[2] ?? "real-data-extraction/learn-sessions";
+	const limit = Number(process.argv[3] ?? 4);
+	const files = fs
+		.readdirSync(dir)
+		.filter((f) => f.endsWith(".md") || f.endsWith(".markdown") || f.endsWith(".txt"))
+		.sort();
+	console.log(`[import-notes] ${files.length} note files from ${dir} (concurrency ${limit})`);
+
+	const pipeline = createExtractionPipeline(stores);
+	const queue = [...files];
+	const totals = { nodes: 0, edges: 0, events: 0, failed: 0 };
+	const workers = Array.from({ length: Math.min(limit, files.length) }, async () => {
+		for (;;) {
+			const file = queue.shift();
+			if (!file) return;
+			const filePath = path.join(dir, file);
+			const t0 = Date.now();
+			try {
+				const stats = await pipeline.importNotes({ filePath, text: fs.readFileSync(filePath, "utf-8") });
+				totals.nodes += stats.nodes;
+				totals.edges += stats.edges;
+				totals.events += stats.events;
+				console.log(
+					`[import-notes] ${file}: ${stats.nodes} nodes, ${stats.edges} edges, ${stats.events} events in ${((Date.now() - t0) / 1000).toFixed(1)}s`,
+				);
+			} catch (err) {
+				totals.failed++;
+				console.error(`[import-notes] ${file} FAILED:`, err);
+			}
+		}
+	});
+	await Promise.all(workers);
+
+	const graph = getGraph(stores.graphStore);
+	console.log(
+		`[import-notes] done: +${totals.nodes} nodes, +${totals.edges} edges, +${totals.events} events, ${totals.failed} failed — ` +
+			`graph now ${graph.nodes.length} nodes, ${graph.edges.length} edges, ${graph.events.length} events`,
+	);
+}
+
+main();

src/agent/subagents/extraction.ts

@@ -1,7 +1,9 @@
+import * as crypto from "node:crypto";
 import type { UIMessage } from "ai";
 import type { Usage } from "@earendil-works/pi-ai";
 import { z } from "zod";
 import { lhTool, toPiTools } from "../lh-tool.ts";
+import type { ModelRole } from "../../../config.ts";
 import type { PiEngine } from "../models.ts";
 import { runSubagent } from "./pi-run.ts";
 import type {
@@ -42,6 +44,17 @@ import { getGraph, mergeFindings, type EmissionStats, type GraphDeps } from "../
  * whatever the in-flight run missed). On failure nothing is checkpointed —
  * the next trigger re-runs the whole thing.
  *
+ * The FORMAT-AGNOSTIC FRONT DOOR (2026-09-13): importNotes() runs the SAME
+ * three stages over raw personal notes (arbitrary format — no chat, no
+ * session, no message ids). A notes-mode extractor prompt replaces the
+ * session one; the auditor and merger are shared (identity + deterministic
+ * appends don't care where text came from). Provenance is the file itself:
+ * source ids ("src_" + path hash) play the chatId role in mappings, events
+ * and checkpoints, and the source record (graphStore sources seam) carries
+ * the file path + the run's usage. No quiz events are ever built from
+ * notes — quiz outcomes inside the text surface only through the
+ * extractor's understanding observations (user-decided 2026-09-13).
+ *
  * Observability (§5 baseline): every stage logs one line per step, its
  * start, and its duration; the pipeline logs a failure line before
  * rethrowing, so the server log reads start → stage timings → merged
@@ -166,6 +179,44 @@ const findingsSchema = z.object({
 		.describe("Quiz attribution — your only event judgment."),
 });
 
+const NOTES_EXTRACTOR_INSTRUCTIONS = `You are the extraction specialist in a learning application. You read ONE source —
+the user's own NOTES, in an ARBITRARY format (personal notes, an exported conversation, a document — anything) — and
+report what those notes show the author engaging with, as structured findings for their global knowledge graph.
+
+There is no session and no chat structure here: the source is raw text, the author's own material. Read it as such.
+
+Report, with verbatim evidence quotes for everything:
+
+NODE THEORY — the graph is a set of TRUE propositions about the world, full stop. A node is never anything about the
+author or the source. The author's relationship to a proposition is expressed ENTIRELY by your understanding note; it
+never leaks into the node itself. So no "the author understands X", no "mentioned in these notes": the node is just X.
+A misconception is NOT a node of its own wrong claim — state the TRUE correction as the proposition.
+
+1. PROPOSITIONS — every distinct reasoning-step-sized proposition the notes actually engage with:
+   - Each has a "name" — a VERY short label, a few words, a compact handle like a glossary headword ("Will to power",
+     "Divine command theory"). Not a sentence; it becomes the node's label in the graph, so keep it glanceable.
+   - And a "statement" — the self-contained TRUE proposition at full precision.
+   - Notes may explain things at length or quote material the author is studying: extract the propositions themselves,
+     one reasoning step each — never a topic blob, never a sub-step.
+   - "messages": ALWAYS an empty list — provenance is the file itself.
+   - "aliases": verbatim phrasings the notes used for the same proposition.
+   - "understanding": ONE word from the fixed scale — "solid", "shaky", "accepted", "resisted", or "not yet engaged" —
+     judging the AUTHOR's grasp of the proposition as the notes show it: their own commentary, self-assessments,
+     recorded quiz outcomes, the way they write about it. Strictly one word, no numbers, no justification (a
+     wrong-shaped note is rejected by the schema). When the notes give no signal, omit the field.
+
+2. EDGES between propositions:
+   - "follows": to is DERIVABLE from from (understanding from makes understanding to achievable).
+   - "supports": from GROUNDS to without entailing it (helpful context, not a prerequisite).
+   - Only relations the notes actually articulate — with evidence.
+
+There is no quiz attribution for notes — the source has no quiz events, and the schema has no attribution field.
+
+Evidence discipline: every quote must appear VERBATIM in the source. The auditor rejects anything unbacked. When in
+doubt, report; the auditor decides.
+
+Your entire deliverable is ONE submit_findings call.`;
+
 const EXTRACTOR_INSTRUCTIONS = `You are the extraction specialist in a learning application. You read ONE session
 transcript and report what was learned — as structured findings for the learner's global knowledge graph.
 
@@ -210,23 +261,30 @@ transcript). The auditor rejects anything unbacked. When in doubt, report; the a
 
 Your entire deliverable is ONE submit_findings call.`;
 
-/** One extractor run: the whole deliverable is ONE zod-validated submit
- *  call (a pi agent purely so the model can retry a schema-invalid call).
- *  Returns the submitted findings — captured from the execute seam, which
+/** One single-submit agent run — the shared shape of EVERY LLM stage
+ *  here (session + notes): the whole deliverable is ONE zod-validated
+ *  submit call (a pi agent purely so the model can retry a schema-invalid
+ *  call). The submitted value is captured from the execute seam, which
  *  only fires on a schema-valid call. */
-async function runExtractor(
-	engine: PiEngine | undefined,
-	prompt: string,
-	signal: AbortSignal | undefined,
-	onStep: (usage: Usage, model: string, step: number, finishReason: string, tools: string) => void,
-): Promise<SessionFindings> {
-	let submitted: SessionFindings | undefined;
+async function runSubmitAgent<T>(opts: {
+	role: ModelRole;
+	toolName: string;
+	toolDescription: string;
+	schema: z.ZodType<T>;
+	systemPrompt: string;
+	prompt: string;
+	engine: PiEngine | undefined;
+	signal: AbortSignal | undefined;
+	onStep: (usage: Usage, model: string, step: number, finishReason: string, tools: string) => void;
+	neverSubmitted: string;
+}): Promise<T> {
+	let submitted: T | undefined;
 	const result = await runSubagent(
 		toPiTools({
-			submit_findings: lhTool({
-				name: "submit_findings",
-				description: "Submit the session findings.",
-				schema: findingsSchema,
+			[opts.toolName]: lhTool({
+				name: opts.toolName,
+				description: opts.toolDescription,
+				schema: opts.schema,
 				execute: async (findings) => {
 					submitted = findings;
 					return findings;
@@ -234,28 +292,71 @@ async function runExtractor(
 			}),
 		}),
 		{
-			role: "extractor",
-			engine,
-			systemPrompt: EXTRACTOR_INSTRUCTIONS,
-			prompt,
+			role: opts.role,
+			engine: opts.engine,
+			systemPrompt: opts.systemPrompt,
+			prompt: opts.prompt,
 			maxTurns: 4,
-			abortSignal: signal,
+			abortSignal: opts.signal,
 			onAssistantMessage: (message, step) =>
-				onStep(
+				opts.onStep(
 					message.usage,
 					message.model,
 					step,
 					message.stopReason,
 					message.content.filter((c) => c.type === "toolCall").map((c) => (c as { name: string }).name).join(", ") || "(none)",
 				),
-			shouldStop: (_message, toolResults) => toolResults.some((r) => r.toolName === "submit_findings" && !r.isError),
+			shouldStop: (_message, toolResults) => toolResults.some((r) => r.toolName === opts.toolName && !r.isError),
 		},
 	);
 	void result;
-	if (!submitted) throw new Error("the extractor never submitted findings");
+	if (!submitted) throw new Error(opts.neverSubmitted);
 	return submitted;
 }
 
+/** The extractor over ONE session transcript (the chat front door). */
+function runExtractor(
+	engine: PiEngine | undefined,
+	prompt: string,
+	signal: AbortSignal | undefined,
+	onStep: (usage: Usage, model: string, step: number, finishReason: string, tools: string) => void,
+): Promise<SessionFindings> {
+	return runSubmitAgent({
+		role: "extractor",
+		toolName: "submit_findings",
+		toolDescription: "Submit the session findings.",
+		schema: findingsSchema,
+		systemPrompt: EXTRACTOR_INSTRUCTIONS,
+		prompt,
+		engine,
+		signal,
+		onStep,
+		neverSubmitted: "the extractor never submitted findings",
+	});
+}
+
+/** The extractor over ONE source of raw personal notes (the format-agnostic
+ *  front door): same single-submit shape, notes-mode prompt + schema. */
+function runNotesExtractor(
+	engine: PiEngine | undefined,
+	prompt: string,
+	signal: AbortSignal | undefined,
+	onStep: (usage: Usage, model: string, step: number, finishReason: string, tools: string) => void,
+): Promise<NotesFindings> {
+	return runSubmitAgent({
+		role: "extractor",
+		toolName: "submit_findings",
+		toolDescription: "Submit the notes findings.",
+		schema: notesFindingsSchema,
+		systemPrompt: NOTES_EXTRACTOR_INSTRUCTIONS,
+		prompt,
+		engine,
+		signal,
+		onStep,
+		neverSubmitted: "the extractor never submitted findings",
+	});
+}
+
 // ─── the auditor ───────────────────────────────────────────────────────────
 
 const auditSchema = findingsSchema.extend({
@@ -279,11 +380,21 @@ const auditSchema = findingsSchema.extend({
 		.describe("Everything you dropped, with the reason — the audit trail."),
 });
 
-const AUDITOR_INSTRUCTIONS = `You are the audit stage of a learning application's extraction pipeline. You receive
-ONE session transcript, a set of proposed findings (propositions, edges, quiz attribution), and the CURRENT
-knowledge graph. Your jobs: the faithfulness net, and identity.
+// The notes front door's shapes: everything session findings have, minus
+// quiz attribution — raw notes have no quiz tool parts, so there is
+// nothing to attribute (and no event to build: outcomes inside the text
+// surface only through understanding observations, user-decided).
+const notesFindingsSchema = findingsSchema.omit({ attribution: true });
+const notesAuditSchema = auditSchema.omit({ attribution: true });
+type NotesFindings = Omit<SessionFindings, "attribution">;
+type NotesAuditResult = Omit<AuditResult, "attribution">;
 
-FAITHFULNESS — verify every candidate against the transcript:
+const AUDITOR_INSTRUCTIONS = `You are the audit stage of a learning application's extraction pipeline. You receive
+ONE source — a session transcript, or the author's personal notes in an ARBITRARY format (the notes front door) — a
+set of proposed findings (propositions, edges, and quiz attribution where the source has quiz lines), and the
+CURRENT knowledge graph. Your jobs: the faithfulness net, and identity.
+
+FAITHFULNESS — verify every candidate against the source text:
 - PROPOSITIONS: every evidence quote must appear (near-)verbatim in the transcript view, and the statement
   must be a faithful reading of it. The node theory applies: a statement must be a TRUE, self-contained,
   world-facing fact — reword learner- or session-relative statements ("the learner understands X" → "X"), state
@@ -293,8 +404,10 @@ FAITHFULNESS — verify every candidate against the transcript:
 - EDGES: the evidence must actually articulate the relation, in the direction claimed. Drop
   direction-swapped or speculative edges.
 - ATTRIBUTION: the QUIZ line's question must genuinely test the attributed proposition. Drop wrong
-  attributions to null, or re-point them to the proposition the question actually tests.
-- UNDERSTANDING levels: verify against the quiz outcomes and the session's evidence; each note must be
+  attributions to null, or re-point them to the proposition the question actually tests. (Session
+  sources only — notes findings carry no attribution; there is nothing to verify.)
+- UNDERSTANDING levels: verify against the quiz outcomes and the session's evidence — or, for notes,
+  the author's own words; each note must be
   exactly one word from the fixed scale ("solid", "shaky", "accepted", "resisted", "not yet engaged") —
   reword or drop anything else. No justifications.
 
@@ -324,47 +437,47 @@ function graphView(nodes: GraphNode[]): string {
 	return lines.join("\n");
 }
 
-/** One auditor run — same single-submit shape as the extractor. */
-async function runAuditor(
+/** The auditor over session findings (the chat front door). */
+function runAuditor(
 	engine: PiEngine | undefined,
 	prompt: string,
 	signal: AbortSignal | undefined,
 	onStep: (usage: Usage, model: string, step: number, finishReason: string, tools: string) => void,
 ): Promise<AuditResult> {
-	let submitted: AuditResult | undefined;
-	const result = await runSubagent(
-		toPiTools({
-			submit_review: lhTool({
-				name: "submit_review",
-				description: "Submit the verified findings subset (with identity verdicts) + the dropped list.",
-				schema: auditSchema,
-				execute: async (review) => {
-					submitted = review;
-					return review;
-				},
-			}),
-		}),
-		{
-			role: "auditor",
-			engine,
-			systemPrompt: AUDITOR_INSTRUCTIONS,
-			prompt,
-			maxTurns: 4,
-			abortSignal: signal,
-			onAssistantMessage: (message, step) =>
-				onStep(
-					message.usage,
-					message.model,
-					step,
-					message.stopReason,
-					message.content.filter((c) => c.type === "toolCall").map((c) => (c as { name: string }).name).join(", ") || "(none)",
-				),
-			shouldStop: (_message, toolResults) => toolResults.some((r) => r.toolName === "submit_review" && !r.isError),
-		},
-	);
-	void result;
-	if (!submitted) throw new Error("the auditor never submitted a review");
-	return submitted;
+	return runSubmitAgent({
+		role: "auditor",
+		toolName: "submit_review",
+		toolDescription: "Submit the verified findings subset (with identity verdicts) + the dropped list.",
+		schema: auditSchema,
+		systemPrompt: AUDITOR_INSTRUCTIONS,
+		prompt,
+		engine,
+		signal,
+		onStep,
+		neverSubmitted: "the auditor never submitted a review",
+	});
+}
+
+/** The auditor over notes findings (the format-agnostic front door): same
+ *  faithfulness + identity job, notes-mode schema (no attribution). */
+function runNotesAuditor(
+	engine: PiEngine | undefined,
+	prompt: string,
+	signal: AbortSignal | undefined,
+	onStep: (usage: Usage, model: string, step: number, finishReason: string, tools: string) => void,
+): Promise<NotesAuditResult> {
+	return runSubmitAgent({
+		role: "auditor",
+		toolName: "submit_review",
+		toolDescription: "Submit the verified findings subset (with identity verdicts) + the dropped list.",
+		schema: notesAuditSchema,
+		systemPrompt: AUDITOR_INSTRUCTIONS,
+		prompt,
+		engine,
+		signal,
+		onStep,
+		neverSubmitted: "the auditor never submitted a review",
+	});
 }
 
 // ─── the pipeline status registry ─────────────────────────────────────────────
@@ -376,6 +489,13 @@ export type ExtractionPhase = "extracting" | "auditing" | "merging";
  *  Exported for the status payload's consumer typing (the dock). */
 export interface RunningExtraction {
 	chatId: string;
+	/** Which front door the run came through — label + usage-persistence
+	 *  depend on it (chats bill their chat record; notes bill the source
+	 *  record). */
+	kind: "chat" | "notes";
+	/** Display label (the file path for notes imports); the status route
+	 *  falls back to the chat store for chat runs. */
+	label?: string;
 	phase: ExtractionPhase;
 	startedAt: number;
 	/** Live per-stage usage, accumulated as steps bill (the dock's cost /
@@ -388,6 +508,10 @@ export interface RunningExtraction {
 
 const runningExtractions = new Map<string, RunningExtraction>();
 
+/** Last minted startedAt — kept monotonic so two runs starting in the same
+ *  millisecond never collide on the usage idempotency key. */
+let lastStartedAt = 0;
+
 /** In-flight pipeline runs (oldest first) — the /api/graph/status payload. */
 export function extractionStatuses(): RunningExtraction[] {
 	return [...runningExtractions.values()].sort((a, b) => a.startedAt - b.startedAt);
@@ -415,22 +539,38 @@ export interface ExtractionModels {
 
 export interface ExtractionPipelineDeps extends GraphDeps, ExtractionModels {}
 
+export interface NotesImportInput {
+	/** The source's file path — its identity (deterministic src id) AND its
+	 *  provenance label in the detail card. */
+	filePath: string;
+	/** The file's raw content, VERBATIM — any format. */
+	text: string;
+}
+
 export interface ExtractionPipeline {
 	/** Extract + audit + merge ONE chat. Single-flight per chat; resolves to
 	 *  the merger's append stats (or throws — no checkpoint on failure). */
 	runExtraction(chatId: string): Promise<EmissionStats>;
+	/** The format-agnostic front door (2026-09-13): run the same pipeline
+	 *  over ONE raw notes file. The source id is deterministic per file
+	 *  path, so re-importing the same file re-runs extraction against the
+	 *  same source identity (mappings + events dedupe by it). */
+	importNotes(input: NotesImportInput): Promise<EmissionStats>;
 }
 
 export function createExtractionPipeline(deps: ExtractionPipelineDeps): ExtractionPipeline {
 	const { chatStore, graphStore } = deps;
 	const inFlight = new Set<string>();
 
-	function setPhase(chatId: string, phase: ExtractionPhase): void {
+	function setPhase(chatId: string, phase: ExtractionPhase, kind: "chat" | "notes", label?: string): void {
 		const prev = runningExtractions.get(chatId);
+		if (!prev) lastStartedAt = Math.max(Date.now(), lastStartedAt + 1);
 		runningExtractions.set(chatId, {
 			chatId,
+			kind,
+			label: prev?.label ?? label, // phase changes never lose the label
 			phase,
-			startedAt: prev?.startedAt ?? Date.now(),
+			startedAt: prev?.startedAt ?? lastStartedAt,
 			usage: prev?.usage ?? {}, // phase changes never lose usage
 			controller: prev?.controller ?? new AbortController(),
 		});
@@ -525,7 +665,7 @@ export function createExtractionPipeline(deps: ExtractionPipelineDeps): Extracti
 	function persistRunUsage(chatId: string, durationMs: number, stats: EmissionStats | undefined): void {
 		const run = runningExtractions.get(chatId);
 		if (!run) return;
-		chatStore.appendExtractionUsage(chatId, {
+		const entry: ExtractionRunUsage = {
 			startedAt: run.startedAt,
 			at: new Date().toISOString(),
 			durationMs,
@@ -534,7 +674,9 @@ export function createExtractionPipeline(deps: ExtractionPipelineDeps): Extracti
 				extractor: run.usage.extractor ?? { model: "unknown", steps: [] },
 				auditor: run.usage.auditor ?? { model: "unknown", steps: [] },
 			},
-		});
+		};
+		if (run.kind === "notes") graphStore.appendSourceUsage(chatId, entry);
+		else chatStore.appendExtractionUsage(chatId, entry);
 	}
 
 	async function runExtraction(chatId: string): Promise<EmissionStats> {
@@ -543,14 +685,19 @@ export function createExtractionPipeline(deps: ExtractionPipelineDeps): Extracti
 		const t0 = performance.now();
 		try {
 			console.info(`[extraction ${chatId}] pipeline start`);
-			setPhase(chatId, "extracting");
+			setPhase(chatId, "extracting", "chat");
 			const findings = await extract(chatId);
-			setPhase(chatId, "auditing");
+			setPhase(chatId, "auditing", "chat");
 			const auditResult = await audit(chatId, findings);
-			setPhase(chatId, "merging");
-			// The merger re-reads the chat record itself — events are rebuilt
-			// from the transcript, never from stale copies.
-			const stats = mergeFindings(chatId, auditResult, { chatStore, graphStore });
+			setPhase(chatId, "merging", "chat");
+			// The merger merges from the CURRENT record — events are rebuilt
+			// from the live transcript, never from stale copies.
+			const record = chatStore.getChat(chatId);
+			if (!record) throw new Error(`Chat not found: ${chatId}`);
+			const stats = mergeFindings(chatId, auditResult, { chatStore, graphStore }, {
+				messages: record.messages as UIMessage[],
+				foldedAt: record.updatedAt,
+			});
 			persistRunUsage(chatId, Math.round(performance.now() - t0), stats);
 			console.info(
 				`[extraction ${chatId}] merged: ${stats.nodes} nodes, ${stats.edges} edges, ${stats.events} events ` +
@@ -577,6 +724,113 @@ export function createExtractionPipeline(deps: ExtractionPipelineDeps): Extracti
 		}
 	}
 
-	return { runExtraction };
+	// ── the notes front door (format-agnostic: raw text in, same graph out) ──
+
+	/** The raw source view the notes stages see: the file path + the text
+	 *  VERBATIM. No message ids — provenance is the file itself. */
+	function notesView(input: { filePath: string; text: string }): string {
+		return `SOURCE (the author's personal notes): ${input.filePath}\n\n${input.text}`;
+	}
+
+	async function notesExtract(input: { id: string; filePath: string; text: string }): Promise<NotesFindings> {
+		const signal = runningExtractions.get(input.id)?.controller.signal;
+		signal?.throwIfAborted(); // an abort during a sync gap ends the run here
+		const view = notesView(input);
+		console.info(`[extraction ${input.id}] notes extractor starting (${view.split("\n").length} source lines)`);
+		const t0 = performance.now();
+		const findings = await runNotesExtractor(
+			deps.extractor,
+			view,
+			signal,
+			(usage, model, step, finishReason, tools) => {
+				recordStep(input.id, "extractor", callUsage(usage), model);
+				console.info(`[extraction] extractor step ${step}: ${finishReason}, tools: ${tools}`);
+			},
+		);
+		console.info(`[extraction ${input.id}] notes extractor done in ${Math.round(performance.now() - t0)}ms`);
+		return findings;
+	}
+
+	async function notesAudit(input: { id: string; filePath: string; text: string }, findings: NotesFindings): Promise<NotesAuditResult> {
+		const signal = runningExtractions.get(input.id)?.controller.signal;
+		signal?.throwIfAborted(); // an abort during the extract→audit gap ends here
+		const graph = getGraph(graphStore);
+		console.info(
+			`[extraction ${input.id}] notes auditor starting (${findings.propositions.length} propositions, ` +
+				`${findings.edges.length} edges, ${graph.nodes.length} graph nodes)`,
+		);
+		const t0 = performance.now();
+		const auditResult = await runNotesAuditor(
+			deps.auditor,
+			`Source:\n\n${notesView(input)}\n\nProposed findings:\n\n${JSON.stringify(findings, null, 2)}\n\n` +
+				`Current knowledge graph (${graph.nodes.length} nodes):\n\n${graphView(graph.nodes)}`,
+			signal,
+			(usage, model, step, finishReason, tools) => {
+				recordStep(input.id, "auditor", callUsage(usage), model);
+				console.info(`[extraction] auditor step ${step}: ${finishReason}, tools: ${tools}`);
+			},
+		);
+		if (auditResult.dropped.length > 0) {
+			console.info(
+				`[extraction ${input.id}] audit dropped ${auditResult.dropped.length}: ` +
+					auditResult.dropped.map((d) => `${d.ref} (${d.reason})`).join("; "),
+			);
+		}
+		console.info(
+			`[extraction ${input.id}] audit kept ${auditResult.propositions.length}/${findings.propositions.length} propositions, ` +
+				`${auditResult.propositions.filter((p) => p.linkTo !== undefined).length} linked to existing nodes`,
+		);
+		console.info(`[extraction ${input.id}] notes auditor done in ${Math.round(performance.now() - t0)}ms`);
+		return auditResult;
+	}
+
+	async function runNotesExtraction(input: { id: string; filePath: string; text: string; importedAt: string }): Promise<EmissionStats> {
+		const { id } = input;
+		if (inFlight.has(id)) return { nodes: 0, edges: 0, events: 0 };
+		inFlight.add(id);
+		const t0 = performance.now();
+		try {
+			console.info(`[extraction ${id}] notes pipeline start (${input.filePath})`);
+			setPhase(id, "extracting", "notes", input.filePath);
+			const findings = await notesExtract(input);
+			setPhase(id, "auditing", "notes", input.filePath);
+			const notesResult = await notesAudit(input, findings);
+			setPhase(id, "merging", "notes", input.filePath);
+			// Normalize to the merger's findings shape: notes carry no quiz
+			// attribution, and the merger scans no quiz parts for notes
+			// (messages: null) — nothing to attribute, nothing to build.
+			const auditResult: AuditResult = { ...notesResult, attribution: { quiz: {} } };
+			const stats = mergeFindings(id, auditResult, { chatStore, graphStore }, { messages: null, foldedAt: input.importedAt });
+			persistRunUsage(id, Math.round(performance.now() - t0), stats);
+			console.info(
+				`[extraction ${id}] merged: ${stats.nodes} nodes, ${stats.edges} edges, ${stats.events} events ` +
+					`(${Math.round(performance.now() - t0)}ms total)`,
+			);
+			return stats;
+		} catch (err) {
+			persistRunUsage(id, Math.round(performance.now() - t0), undefined);
+			if (err instanceof Error && err.name === "AbortError") {
+				console.info(`[extraction ${id}] aborted (${Math.round(performance.now() - t0)}ms) — nothing merged, nothing checkpointed`);
+				return { nodes: 0, edges: 0, events: 0 };
+			}
+			console.error(`[extraction ${id}] notes pipeline failed (${Math.round(performance.now() - t0)}ms):`, err);
+			throw err;
+		} finally {
+			inFlight.delete(id);
+			runningExtractions.delete(id); // done or failed — no longer running
+		}
+	}
+
+	/** Import ONE raw notes file: register the source (deterministic id per
+	 *  file path — re-import keeps the same identity and its usage history)
+	 *  and run the pipeline over it. */
+	async function importNotes(input: NotesImportInput): Promise<EmissionStats> {
+		const id = `src_${crypto.createHash("sha256").update(input.filePath).digest("hex").slice(0, 12)}`;
+		const importedAt = new Date().toISOString();
+		graphStore.upsertSource({ id, filePath: input.filePath, importedAt });
+		return runNotesExtraction({ id, ...input, importedAt });
+	}
+
+	return { runExtraction, importNotes };
 }
 

src/core/contracts/graph.ts

@@ -20,6 +20,8 @@
 /** Two relations only (DECIDED 2026-09-02): follows = b is derivable from a;
  *  supports = a grounds b without entailing it. No scalars, no encoded
  *  strength — strength is derived at read time from topology. */
+import type { ExtractionRunUsage } from "./chat.ts";
+
 export type EdgeType = "follows" | "supports";
 
 /** What one extraction run merged into the graph ledgers — the merger's
@@ -37,10 +39,32 @@ export interface EmissionStats {
  *  edges record every (chat, message) where they came up, deep-linkable to
  *  the exact transcript point. */
 export interface ProvenancePoint {
+	/** The chat this point anchors to — or a notes source id ("src_…"):
+	 *  imports carry no message anchors (provenance is the file itself,
+	 *  recorded through the mapping line + the source record). */
 	chatId: string;
 	messageId: string;
 }
 
+/** One imported notes file — the format-agnostic front door's bookkeeping
+ *  (DECIDED 2026-09-13): personal notes in ARBITRARY formats run through the
+ *  same extractor → auditor → merger pipeline, with the file itself as the
+ *  provenance anchor. There is no chat: the detail card shows the file path
+ *  as a STATIC entry (not a link), and understanding observations still
+ *  apply (judged from the author's own voice in the notes). The run's usage
+ *  log lives here, mirroring ChatRecord.extractions. Ids are "src_" + hash
+ *  of the file path — deterministic, so re-importing the same file re-runs
+ *  extraction against the same source id (mappings/events dedupe by it). */
+export interface NotesSource {
+	id: string;
+	filePath: string;
+	/** ISO — when this file was imported (the checkpoint's foldedAt). */
+	importedAt: string;
+	/** The run's usage log — same append-only discipline as
+	 *  ChatRecord.extractions, idempotent per startedAt. */
+	extractions?: ExtractionRunUsage[];
+}
+
 export interface GraphNode {
 	/** Opaque stable id, store-assigned: "n_" + nanoid-like. */
 	id: string;
@@ -107,6 +131,8 @@ export interface LedgerEvent {
 	/** null = not yet attributed. */
 	nodeId: string | null;
 	kind: LedgerEventKind;
+	/** The chat that produced this evidence — or a notes source id
+	 *  ("src_…") for imported-notes observations. */
 	chatId: string;
 	at: string;
 	/** Idempotency key: the quiz part's toolCallId, or `obs:<sourceId>` for
@@ -249,6 +275,10 @@ export interface GraphSnapshot {
 	edges: GraphEdge[];
 	/** chatId → title, for every chat that touched the graph. */
 	sessions: Record<string, string>;
+	/** srcId → file path, for every IMPORTED NOTES file that touched the
+	 *  graph (the format-agnostic front door): a static provenance entry —
+	 *  the detail card shows the path as plain text, not a link. */
+	fileSources: Record<string, string>;
 	/** nodeId → chatIds that touched the node (click-through provenance). */
 	nodeSessions: Record<string, string[]>;
 	/** nodeId → chatId → that session's understanding observation (the

src/core/graph.ts

@@ -64,6 +64,17 @@ function newGraphNodeId(): string {
 	return `n_${randomBytes(6).toString("hex")}`;
 }
 
+/** What one merge run merges FROM (the caller supplies it — the merger never
+ *  reads the chat store): a session's transcript + its `updatedAt`
+ *  checkpoint, or — for the format-agnostic notes front door (2026-09-13) —
+ *  `messages: null`: raw notes carry no tool parts, so no quiz events are
+ *  rebuilt (quiz outcomes inside notes surface only through the extractor's
+ *  understanding observations), and the checkpoint stamps the import. */
+export interface MergeSource {
+	messages: UIMessage[] | null;
+	foldedAt: string;
+}
+
 // ─── transcript scanning (shared by the merger + trigger) ─────────────────────
 
 /** A flattened, order-preserving view of every tool part in a transcript. */
@@ -126,11 +137,15 @@ const samePoint = (a: ProvenancePoint, b: ProvenancePoint): boolean =>
  * parts, nodeId from the extractor's attribution through this run's
  * mapping) plus one observation event per proposition carrying an
  * understanding note (ref `obs:<sourceId>`). No taught events, ever.
+ *
+ * `chatId` is the run's source key: a real chat, or a notes source id
+ * ("src_…") for the format-agnostic import path — same ledgers, same
+ * idempotency, one graph. The `source` parameter carries the transcript
+ * being merged (null messages = raw notes: no quiz events) and the
+ * checkpoint stamp; the merger itself is chat-store-free.
  */
-export function mergeFindings(chatId: string, audit: AuditResult, deps: GraphDeps): EmissionStats {
-	const { graphStore: ledgers, chatStore } = deps;
-	const record = chatStore.getChat(chatId);
-	if (!record) return { nodes: 0, edges: 0, events: 0 };
+export function mergeFindings(chatId: string, audit: AuditResult, deps: GraphDeps, source: MergeSource): EmissionStats {
+	const { graphStore: ledgers } = deps;
 	const stats: EmissionStats = { nodes: 0, edges: 0, events: 0 };
 
 	// 1. Resolution: this run's propositions → graph node ids. Existing
@@ -214,7 +229,7 @@ export function mergeFindings(chatId: string, audit: AuditResult, deps: GraphDep
 	for (const event of ledgers.readEvents()) {
 		if (event.chatId === chatId && event.ref) seenRefs.add(event.ref);
 	}
-	for (const part of toolParts(record.messages)) {
+	for (const part of source.messages ? toolParts(source.messages) : []) {
 		if (part.name !== "quiz" || part.state !== "output-available") continue;
 		const event = quizEvent(part, chatId, audit, mapping, now);
 		if (event?.ref !== undefined && !seenRefs.has(event.ref)) {
@@ -241,8 +256,9 @@ export function mergeFindings(chatId: string, audit: AuditResult, deps: GraphDep
 		stats.events++;
 	}
 
-	// 4. Checkpoint: this chat is extracted through its current updatedAt.
-	ledgers.appendCheckpoint({ chatId, foldedAt: record.updatedAt });
+	// 4. Checkpoint: this source is extracted through its foldedAt (the
+	//    chat's updatedAt, or the import time for notes).
+	ledgers.appendCheckpoint({ chatId, foldedAt: source.foldedAt });
 	return stats;
 }
 
@@ -423,20 +439,28 @@ export function graphSnapshot(deps: GraphDeps): GraphSnapshot {
 		if (event.nodeId !== null) touch(event.nodeId, event.chatId);
 	}
 
-	// Titles for every chat the graph can point back at.
-	const chatIds = new Set<string>();
+	// Labels for every source the graph can point back at: real chats
+	// (title, deep-linkable) and imported notes files (path, static — the
+	// format-agnostic front door's provenance).
+	const sourceIds = new Set<string>();
 	for (const chats of nodeChats.values()) {
-		for (const id of chats) chatIds.add(id);
+		for (const id of chats) sourceIds.add(id);
 	}
 	const sessions: Record<string, string> = {};
-	for (const id of chatIds) {
+	const fileSources: Record<string, string> = {};
+	for (const id of sourceIds) {
 		const chat = deps.chatStore.getChat(id);
-		if (chat) sessions[id] = chat.title;
+		if (chat) {
+			sessions[id] = chat.title;
+			continue;
+		}
+		const source = deps.graphStore.readSources().find((s) => s.id === id);
+		if (source) fileSources[id] = source.filePath;
 	}
 
 	const nodeSessions: Record<string, string[]> = {};
 	for (const [nodeId, chats] of nodeChats) {
-		const ids = [...chats].filter((id) => sessions[id] !== undefined);
+		const ids = [...chats].filter((id) => sessions[id] !== undefined || fileSources[id] !== undefined);
 		if (ids.length > 0) nodeSessions[nodeId] = ids;
 	}
 
@@ -461,7 +485,7 @@ export function graphSnapshot(deps: GraphDeps): GraphSnapshot {
 		(nodeObservations[nodeId] ??= {})[chatId] = note;
 	}
 
-	return { nodes, edges, sessions, nodeSessions, nodeObservations };
+	return { nodes, edges, sessions, fileSources, nodeSessions, nodeObservations };
 }
 
 // Re-export: the contract owns the shape; legacy importers still reach it.

src/core/ports.ts

@@ -24,6 +24,7 @@ import type {
 	PlanTree,
 	SessionCheckpoint,
 	TurnUsage,
+	NotesSource,
 } from "./contracts.ts";
 
 // ─── ChatStore — the session record's home (data/chats) ─────────────────────
@@ -80,6 +81,15 @@ export interface GraphStore {
 	/** Append one emission checkpoint. */
 	appendCheckpoint(checkpoint: SessionCheckpoint): void;
 	readCheckpoints(): SessionCheckpoint[];
+
+	/** Upsert one imported-notes source record (config.SOURCES_FILE — a
+	 *  JSON map, not a ledger; an upsert keeps the existing usage log). */
+	upsertSource(source: NotesSource): void;
+	/** Every notes source record, by id order-insensitive. */
+	readSources(): NotesSource[];
+	/** Append one run's usage to a source record — idempotent per
+	 *  startedAt, mirroring ChatRecord.extractions. */
+	appendSourceUsage(id: string, entry: ExtractionRunUsage): void;
 }
 
 // ─── JobStore — background sub-agent jobs (data/jobs) ─────────────────────────

src/server/chat-handler.ts

@@ -37,7 +37,10 @@ const jobRunner = createJobRunner({
 	jobStore: stores.jobStore,
 	deliver: deliverJobResult,
 });
-const extraction = createExtractionPipeline(stores);
+/** The app's ONE extraction pipeline instance — both front doors share it:
+ *  quiz-triggered session runs (turn-service) and notes imports
+ *  (/api/graph/import) hit the same single-flight registry. */
+export const extraction = createExtractionPipeline(stores);
 
 // Wake-pipeline wiring (contracts.ts "THE ASYNC PROTOCOL" §4): the pipeline
 // fires its server-side teacher turns through THIS composition root, and

src/store/graph.ts

@@ -15,6 +15,10 @@
  *                                      (chatId, sourceId) → graphNodeId
  *   sessions.jsonl  SessionCheckpoint— emission checkpoints (foldedAt)
  *
+ * Plus config.SOURCES_FILE (sources.json): the imported-notes bookkeeping
+ * (NOT a ledger) — one JSON map, src-id → NotesSource, read-modify-write
+ * like a chat file. The format-agnostic front door (2026-09-13).
+ *
  * Implements core/ports.ts GraphStore. data/graph/* is exclusively this
  * adapter's. Reads are strict against the contracts.ts shapes (the 2026-09-02
  * graph redesign): corrupt lines are skipped, never guessed at — the ledgers
@@ -25,12 +29,14 @@
 
 import * as fs from "node:fs";
 import * as path from "node:path";
-import { LEDGER_FILES } from "../../config.ts";
+import { LEDGER_FILES, SOURCES_FILE } from "../../config.ts";
 import type {
 	GraphEdge,
 	GraphNode,
+	ExtractionRunUsage,
 	LedgerEvent,
 	LedgerEventKind,
+	NotesSource,
 	NodeMapping,
 	ProvenancePoint,
 	SessionCheckpoint,
@@ -157,4 +163,57 @@ export const graphStore: GraphStore = {
 	readCheckpoints(): SessionCheckpoint[] {
 		return readValid(LEDGER_FILES.sessions, isCheckpoint);
 	},
+
+	// ── imported-notes bookkeeping (config.SOURCES_FILE — a JSON map) ──
+
+	/** Upsert: keeps the existing record's usage log when re-importing. */
+	upsertSource(source: NotesSource): void {
+		const all = readSourceMap();
+		const prev = all[source.id];
+		all[source.id] = prev ? { ...source, extractions: prev.extractions } : source;
+		writeSourceMap(all);
+	},
+	readSources(): NotesSource[] {
+		return Object.values(readSourceMap());
+	},
+	/** Idempotent per startedAt — same discipline as chats.appendExtractionUsage. */
+	appendSourceUsage(id: string, entry: ExtractionRunUsage): void {
+		const all = readSourceMap();
+		const source = all[id];
+		if (!source) return; // no such source — nothing to bill against
+		source.extractions = source.extractions?.some((r) => r.startedAt === entry.startedAt)
+			? source.extractions
+			: [...(source.extractions ?? []), entry];
+		writeSourceMap(all);
+	},
 };
+
+/** sources.json — { id: NotesSource }. Read-modify-write, NOT append-only:
+ *  the usage log lives inside the record (like a chat's JSON file). */
+function readSourceMap(): Record<string, NotesSource> {
+	let raw: string;
+	try {
+		raw = fs.readFileSync(SOURCES_FILE, "utf-8");
+	} catch {
+		return {};
+	}
+	try {
+		const parsed: unknown = JSON.parse(raw);
+		if (!isRecord(parsed)) return {};
+		const out: Record<string, NotesSource> = {};
+		for (const [id, value] of Object.entries(parsed)) {
+			if (isNotesSource(value)) out[id] = value;
+		}
+		return out;
+	} catch {
+		return {};
+	}
+}
+
+function writeSourceMap(map: Record<string, NotesSource>): void {
+	fs.mkdirSync(path.dirname(SOURCES_FILE), { recursive: true });
+	fs.writeFileSync(SOURCES_FILE, JSON.stringify(map, null, "\t"), "utf-8");
+}
+
+const isNotesSource = (v: unknown): v is NotesSource =>
+	isRecord(v) && isString(v.id) && isString(v.filePath) && isString(v.importedAt);

tests/extraction.test.ts

@@ -27,10 +27,12 @@ import type { UIMessage } from "ai";
 import type { PiEngine } from "../src/agent/models.ts";
 import type {
 	AuditResult,
+	ExtractionRunUsage,
 	GraphEdge,
 	GraphNode,
 	LedgerEvent,
 	NodeMapping,
+	NotesSource,
 	SessionCheckpoint,
 	SessionFindings,
 } from "../src/core/contracts.ts";
@@ -60,6 +62,7 @@ function memoryLedgers() {
 	const events: LedgerEvent[] = [];
 	const mappings: NodeMapping[] = [];
 	const checkpoints: SessionCheckpoint[] = [];
+	const sources = new Map<string, NotesSource>();
 	return {
 		appendNode: (n: GraphNode) => void nodes.push(n),
 		readNodes: () => nodes.map((n) => ({ ...n })),
@@ -71,6 +74,19 @@ function memoryLedgers() {
 		readMappings: () => mappings.map((m) => ({ ...m })),
 		appendCheckpoint: (c: SessionCheckpoint) => void checkpoints.push(c),
 		readCheckpoints: () => checkpoints.map((c) => ({ ...c })),
+		upsertSource: (s: NotesSource) => {
+			// Mirrors the real store: an upsert KEEPS the existing usage log.
+			const prev = sources.get(s.id);
+			sources.set(s.id, { ...s, extractions: [...(prev?.extractions ?? [])] });
+		},
+		readSources: () => [...sources.values()].map((s) => ({ ...s, extractions: [...(s.extractions ?? [])] })),
+		appendSourceUsage: (id: string, entry: ExtractionRunUsage) => {
+			const source = sources.get(id);
+			if (!source) return;
+			if (!source.extractions?.some((r) => r.startedAt === entry.startedAt)) {
+				source.extractions = [...(source.extractions ?? []), entry];
+			}
+		},
 	} satisfies GraphStore;
 }
 
@@ -513,3 +529,123 @@ describe("the extraction pipeline (extractor → auditor → merger)", () => {
 		await assert.rejects(pipeline.runExtraction("chat_does_not_exist"), /Chat not found/);
 	});
 });
+
+// ── the notes front door (format-agnostic import) ────────────────────────────
+
+/** Raw personal notes — arbitrary format, no session, no message ids. */
+const NOTES_TEXT = `> [!quote] YOU
+> teach me vim
+
+> [!abstract] PI
+> Vim always starts in Normal mode — keys are commands, not text.`;
+
+/** What the notes-mode extractor submits: same shapes minus attribution,
+ *  and messages always empty (the file is the provenance). */
+const NOTES_FINDINGS = {
+	propositions: [
+		{
+			id: "p1",
+			name: "Vim normal mode",
+			statement: "Vim starts in Normal mode, where keys are commands.",
+			aliases: [],
+			messages: [],
+			evidence: ["Vim always starts in Normal mode — keys are commands, not text."],
+			understanding: "solid",
+		},
+	],
+	edges: [],
+} as const;
+
+const NOTES_VERDICT = {
+	propositions: [NOTES_FINDINGS.propositions[0]],
+	edges: [],
+	dropped: [],
+} as const;
+
+describe("the notes front door (importNotes — format-agnostic)", () => {
+	it("imports raw notes end to end: source record, file-scoped provenance, no quiz events", async () => {
+		const ledgers = memoryLedgers();
+		const seen: { kind?: string; label?: string }[] = [];
+		const pipeline = createExtractionPipeline({
+			chatStore,
+			graphStore: ledgers,
+			extractor: submitModel("submit_findings", NOTES_FINDINGS),
+			// During the auditor's call the registry must show the notes run.
+			auditor: submitModel("submit_review", NOTES_VERDICT, () => {
+				const run = extractionStatuses().find((r) => r.chatId.startsWith("src_"));
+				seen.push({ kind: run?.kind, label: run?.label });
+			}),
+		});
+		const stats = await pipeline.importNotes({ filePath: "/vault/learn vim.md", text: NOTES_TEXT });
+
+		assert.deepEqual(stats, { nodes: 1, edges: 0, events: 1 });
+		// The run surfaced as a NOTES run labeled with the file path.
+		assert.deepEqual(seen, [{ kind: "notes", label: "/vault/learn vim.md" }]);
+		assert.equal(extractionStatuses().length, 0, "the registry clears when the run ends");
+
+		// The source record: deterministic src id, the file path, the usage log.
+		const source = ledgers.readSources()[0]!;
+		assert.match(source.id, /^src_/);
+		assert.equal(source.filePath, "/vault/learn vim.md");
+		assert.ok(Date.parse(source.importedAt));
+		assert.equal(source.extractions?.length, 1, "the run's usage persisted into the source record");
+		assert.equal(source.extractions![0]!.stats?.nodes, 1);
+		assert.ok(source.extractions![0]!.stages.extractor.steps.length > 0, "faux usage captured");
+
+		// File-scoped provenance: the mapping line carries the source id;
+		// the node carries NO message anchors.
+		const node = ledgers.readNodes()[0]!;
+		assert.equal(node.statement, "Vim starts in Normal mode, where keys are commands.");
+		assert.deepEqual(node.provenance, []);
+		assert.deepEqual(ledgers.readMappings(), [{ chatId: source.id, sourceId: "p1", graphNodeId: node.id }]);
+
+		// One observation event, zero quiz events — outcomes inside notes
+		// surface only through understanding observations (user-decided).
+		const events = ledgers.readEvents();
+		assert.deepEqual(
+			events.map((e) => [e.kind, e.chatId, e.ref, e.note]),
+			[["observation", source.id, "obs:p1", "solid"]],
+		);
+		// The checkpoint stamps the import.
+		assert.equal(ledgers.readCheckpoints()[0]!.chatId, source.id);
+	});
+
+	it("re-importing the same file is idempotent: same source identity, refs dedupe, usage history grows", async () => {
+		const ledgers = memoryLedgers();
+		const mk = () =>
+			createExtractionPipeline({
+				chatStore,
+				graphStore: ledgers,
+				extractor: submitModel("submit_findings", NOTES_FINDINGS),
+				auditor: submitModel("submit_review", NOTES_VERDICT),
+			});
+		const first = await mk().importNotes({ filePath: "/vault/learn vim.md", text: NOTES_TEXT });
+		assert.deepEqual(first, { nodes: 1, edges: 0, events: 1 });
+
+		const second = await mk().importNotes({ filePath: "/vault/learn vim.md", text: NOTES_TEXT });
+		assert.deepEqual(second, { nodes: 0, edges: 0, events: 0 }, "the same source id dedupes everything");
+
+		assert.equal(ledgers.readSources().length, 1, "one source identity — the path hashes to the same id");
+		assert.equal(ledgers.readSources()[0]!.extractions?.length, 2, "both runs billed their usage");
+		assert.equal(ledgers.readNodes().length, 1, "no duplicate node");
+	});
+
+	it("aborts like a chat run: true cancellation, nothing merged, partial usage in the source record", async () => {
+		const ledgers = memoryLedgers();
+		const pipeline = createExtractionPipeline({
+			chatStore,
+			graphStore: ledgers,
+			extractor: hangingModel(),
+			auditor: submitModel("submit_review", NOTES_VERDICT),
+		});
+		const runPromise = pipeline.importNotes({ filePath: "/vault/learn vim.md", text: NOTES_TEXT });
+
+		const srcId = extractionStatuses().find((r) => r.chatId.startsWith("src_"))!.chatId;
+		assert.equal(abortExtraction(srcId), true);
+		assert.deepEqual(await runPromise, { nodes: 0, edges: 0, events: 0 });
+		assert.equal(ledgers.readNodes().length, 0, "nothing merged");
+		assert.equal(ledgers.readCheckpoints().length, 0, "nothing checkpointed");
+		assert.equal(ledgers.readSources()[0]!.extractions?.length, 1, "partial usage still persisted");
+		assert.equal(ledgers.readSources()[0]!.extractions![0]!.stats, undefined, "never merged → no stats");
+	});
+});

tests/graph.test.ts

@@ -23,14 +23,22 @@ import type { QuestionAnswerData } from "../src/core/question-core.ts";
 import { getGraph, graphSnapshot, mergeFindings, pendingQuizAnswers, type GraphDeps } from "../src/core/graph.ts";
 import { graphStore } from "../src/store/graph.ts";
 import { chatStore } from "../src/store/chats.ts";
-import { LEDGER_FILES, PATHS } from "../config.ts";
+import { LEDGER_FILES, PATHS, SOURCES_FILE } from "../config.ts";
 
 /** The wired fs adapters, exactly what src/server/stores.ts passes in production. */
 const graphDeps = { chatStore, graphStore } as const satisfies GraphDeps;
 
+/** The session merge source for a chat — what the pipeline passes: the live
+ *  transcript + its updatedAt checkpoint stamp. (Notes imports pass
+ *  messages: null — see the notes-merger test below.) */
+function sessionSource(chatId: string): { messages: UIMessage[]; foldedAt: string } {
+	const record = chatStore.getChat(chatId)!;
+	return { messages: record.messages as UIMessage[], foldedAt: record.updatedAt };
+}
+
 // ─── ledger isolation (backup-and-clear of data/graph/*.jsonl) ──────────────
 
-const LEDGER_PATHS = Object.values(LEDGER_FILES);
+const LEDGER_PATHS = [...Object.values(LEDGER_FILES), SOURCES_FILE];
 const backups: Array<{ file: string; bak: string }> = [];
 const createdChats: string[] = [];
 
@@ -233,7 +241,7 @@ function scopedGraph(chatIds: string[]) {
 
 describe("the merger (mergeFindings)", () => {
 	it("creates nodes from the verdicts, rebuilds quiz events deterministically, records observations", () => {
-		const stats = mergeFindings(chat1.id, fixtureAudit(), graphDeps);
+		const stats = mergeFindings(chat1.id, fixtureAudit(), graphDeps, sessionSource(chat1.id));
 		assert.deepEqual(stats, { nodes: 3, edges: 1, events: 6 });
 
 		const graph = scopedGraph([chat1.id]);
@@ -302,7 +310,7 @@ describe("the merger (mergeFindings)", () => {
 	});
 
 	it("is idempotent — re-merging the same verdicts appends nothing", () => {
-		const stats = mergeFindings(chat1.id, fixtureAudit(), graphDeps);
+		const stats = mergeFindings(chat1.id, fixtureAudit(), graphDeps, sessionSource(chat1.id));
 		assert.deepEqual(stats, { nodes: 0, edges: 0, events: 0 });
 		const graph = scopedGraph([chat1.id]);
 		assert.equal(graph.nodes.length, 3);
@@ -346,6 +354,7 @@ describe("the merger (mergeFindings)", () => {
 				dropped: [],
 			},
 			graphDeps,
+			sessionSource(chat2.id),
 		);
 		assert.deepEqual(stats, { nodes: 0, edges: 0, events: 1 });
 
@@ -363,6 +372,41 @@ describe("the merger (mergeFindings)", () => {
 		assert.deepEqual(m, { chatId: chat2.id, sourceId: "q1", graphNodeId: alphaId });
 	});
 
+	it("resolves imported-notes ids to their file paths in the snapshot (static provenance)", () => {
+		// The notes front door in miniature: a source record + a merge under
+		// its src id — the snapshot must label it with the file path (a
+		// static entry), never as a chat session.
+		graphStore.upsertSource({ id: "src_snapfixture", filePath: "/vault/learn vim.md", importedAt: "2026-09-13T00:00:00.000Z" });
+		mergeFindings(
+			"src_snapfixture",
+			{
+				propositions: [
+					{
+						id: "p1",
+						name: "Vim registers",
+						statement: "Vim registers map single keys to editing commands.",
+						aliases: [],
+						messages: [],
+						evidence: ["fixture evidence"],
+						understanding: "solid",
+					},
+				],
+				edges: [],
+				attribution: { quiz: {} },
+				dropped: [],
+			},
+			graphDeps,
+			{ messages: null, foldedAt: "2026-09-13T00:00:00.000Z" },
+		);
+		const snap = graphSnapshot(graphDeps);
+		const node = snap.nodes.find((n) => n.statement === "Vim registers map single keys to editing commands.")!;
+		assert.equal(snap.fileSources["src_snapfixture"], "/vault/learn vim.md");
+		assert.deepEqual(snap.nodeSessions[node.id], ["src_snapfixture"], "the file entry joins the node's sessions list");
+		assert.equal(snap.sessions["src_snapfixture"], undefined, "a notes source is never a chat session");
+		// The understanding observation joins under the source id like any session's.
+		assert.equal(snap.nodeObservations[node.id]!["src_snapfixture"], "solid");
+	});
+
 	it("derives sessions and per-session understanding observations in graphSnapshot", () => {
 		const snap = graphSnapshot(graphDeps);
 		const idByStatement = new Map(snap.nodes.map((n) => [n.statement, n.id]));
@@ -408,17 +452,54 @@ describe("the merger (mergeFindings)", () => {
 				dropped: [],
 			},
 			graphDeps,
+			sessionSource(chat3.id),
 		);
 		assert.equal(stats.nodes, 1, "created — the merger does not match strings");
 		assert.equal(getGraph(graphStore).nodes.filter((n) => n.statement === "Alpha intuition").length, 2);
 	});
 
-	it("returns zeros for unknown chats", () => {
-		assert.deepEqual(mergeFindings("chat_does_not_exist", fixtureAudit(), graphDeps), {
-			nodes: 0,
-			edges: 0,
-			events: 0,
+	it("merges the notes front door: source id as chatId, no quiz events, checkpoint at import time", () => {
+		// Raw personal notes carry no transcript — the merger gets no
+		// message parts, so NO quiz events are rebuilt; the understanding
+		// observation still lands, keyed to the source id.
+		const stats = mergeFindings(
+			"src_notesfixture",
+			{
+				propositions: [
+					{
+						id: "p1",
+						name: "Vim normal mode",
+						statement: "Vim starts in Normal mode, where keys are commands.",
+						aliases: [],
+						messages: [], // notes carry no message anchors — the file is the provenance
+						evidence: ["fixture evidence"],
+						understanding: "solid",
+					},
+				],
+				edges: [],
+				attribution: { quiz: {} }, // normalized by the notes pipeline — nothing to attribute
+				dropped: [],
+			},
+			graphDeps,
+			{ messages: null, foldedAt: "2026-09-13T00:00:00.000Z" },
+		);
+		assert.deepEqual(stats, { nodes: 1, edges: 0, events: 1 });
+
+		const node = getGraph(graphStore).nodes.find((n) => n.statement.startsWith("Vim starts"))!;
+		assert.deepEqual(node.provenance, [], "no message anchors — the mapping line carries the source");
+		assert.deepEqual(graphStore.readMappings().find((m) => m.chatId === "src_notesfixture"), {
+			chatId: "src_notesfixture",
+			sourceId: "p1",
+			graphNodeId: node.id,
 		});
+		// The observation event is file-scoped; no quiz events exist.
+		const events = graphStore.readEvents().filter((e) => e.chatId === "src_notesfixture");
+		assert.deepEqual(
+			events.map((e) => [e.kind, e.ref, e.note]),
+			[["observation", "obs:p1", "solid"]],
+		);
+		// The checkpoint stamps the import time.
+		assert.equal(graphStore.readCheckpoints().find((c) => c.chatId === "src_notesfixture")?.foldedAt, "2026-09-13T00:00:00.000Z");
 	});
 });
 
@@ -452,7 +533,7 @@ describe("the trigger helper (pendingQuizAnswers)", () => {
 		assert.equal(pendingQuizAnswers(chat.id, graphDeps), 1, "one answered quiz pending");
 		assert.equal(pendingQuizAnswers("chat_does_not_exist", graphDeps), 0);
 
-		mergeFindings(chat.id, fixtureAudit(), graphDeps);
+		mergeFindings(chat.id, fixtureAudit(), graphDeps, sessionSource(chat.id));
 		// call-s is unattributed here (fixtureAudit has no call-s attribution)
 		// — but it still becomes an event, so nothing stays pending.
 		assert.equal(pendingQuizAnswers(chat.id, graphDeps), 0, "extracted → nothing pending");

tests/usage.test.ts

@@ -10,7 +10,8 @@ import test from "node:test";
 import * as fs from "node:fs";
 
 import { chatStore } from "../src/store/chats.ts";
-import { PATHS } from "../config.ts";
+import { graphStore } from "../src/store/graph.ts";
+import { PATHS, SOURCES_FILE } from "../config.ts";
 import { callCost, contextWindow, jobCost, sessionCost, sumSteps, turnCost } from "../src/core/prices.ts";
 import type { CallUsage, ExtractionRunUsage, JobRecord, TurnUsage } from "../src/core/contracts.ts";
 
@@ -170,3 +171,40 @@ test("appendExtractionUsage: appends, idempotent per startedAt, not in list payl
 
 	fs.unlinkSync(`${PATHS.chats}/${record.id}.json`);
 });
+
+test("appendSourceUsage: appends to the source record, idempotent per startedAt, upsert keeps history", () => {
+	// The real fs graphStore — sources.json backed up and restored around
+	// this test (same discipline as the chat fixture files).
+	fs.mkdirSync(PATHS.graph, { recursive: true });
+	let bak: string | undefined;
+	if (fs.existsSync(SOURCES_FILE)) bak = `${SOURCES_FILE}.w5test.bak`;
+	if (bak) fs.renameSync(SOURCES_FILE, bak);
+	try {
+		const runEntry = (startedAt: number): ExtractionRunUsage => ({
+			startedAt,
+			at: "2026-09-13T00:00:00Z",
+			durationMs: 42_000,
+			stats: { nodes: 1, edges: 2, events: 3 },
+			stages: {
+				extractor: { model: "z-ai/glm-5.3-flash", steps: [call({ inputTokens: 100, outputTokens: 10 })] },
+				auditor: { model: "z-ai/glm-5.3-flash", steps: [call({ inputTokens: 50, outputTokens: 5 })] },
+			},
+		});
+		const id = "src_usagetest01";
+		graphStore.upsertSource({ id, filePath: "/vault/usagetest.md", importedAt: "2026-09-13T00:00:00Z" });
+		graphStore.appendSourceUsage(id, runEntry(1));
+		graphStore.appendSourceUsage(id, runEntry(1)); // same run appended twice → no-op
+		graphStore.appendSourceUsage(id, runEntry(2)); // a retried run is a NEW spend
+		assert.equal(graphStore.readSources().find((s) => s.id === id)?.extractions?.length, 2);
+
+		// An upsert (re-import) KEEPS the usage history.
+		graphStore.upsertSource({ id, filePath: "/vault/usagetest.md", importedAt: "2026-09-14T00:00:00Z" });
+		assert.equal(graphStore.readSources().find((s) => s.id === id)?.extractions?.length, 2);
+
+		// Unknown ids are a silent no-op (nothing to bill against).
+		graphStore.appendSourceUsage("src_nope", runEntry(1));
+	} finally {
+		fs.rmSync(SOURCES_FILE, { force: true });
+		if (bak) fs.renameSync(bak, SOURCES_FILE);
+	}
+});