wave 7: the prober reads its map — graph-context injection dies whole

The owner's zero-configuration ruling (2026-09-23): nothing configures
the graph beyond chat models. The prior-knowledge injection — its budget
dial, its runner, its marker part, its dock/dispatch entries — is
removed across all bands; the prober now reads the learner's persistent
knowledge map on demand through two gated tools instead:

- list_sessions: every birth session, names + kinds + counts + dates
  (graphSessionIndex, Platform's core seam)
- list_propositions(session): what was born there + the session's own
  latest understanding level + that evaluation's date
  (graphSessionPropositions) — names/levels/dating ONLY, no statement
  text (owner ruling: the map's organization is the prober's business,
  its prose is not)

Registered via createProberTools when chat-handler passes graphStore
(the graphToolsEnabled gate decided server-side, per-turn fresh); the
prober doctrine gains the map-review nudge at session start.

Also: runner's JobKind special-casing collapses (KIND_ROLE/KIND_RUNNERS
are plain records again), semantic-clusters.ts dies with its test, the
embedder dep's doc tells the wave-7 stub story, and ports.ts's
readClusterLabels/readNamingRuns surface stays untouched for Platform's
ledger-port interlude.

848/848 tests, typecheck/lint/build green.

src/server/settings-body.ts

@@ -12,7 +12,7 @@
  */
 
 import type { ThinkingLevel } from "@earendil-works/pi-agent-core";
-import { GRAPH_CONTEXT_TOKENS_MAX, isHexColor, type ChatSettings } from "../core";
+import { isHexColor, type ChatSettings } from "../core";
 import type {
 	AgentSettings,
 	AppearanceSettings,
@@ -37,7 +37,6 @@ export function parseSettingsBody(body: unknown): SettingsBodyResult<ChatSetting
 	const raw = body as {
 		model?: { provider?: unknown; id?: unknown };
 		thinkingLevel?: unknown;
-		graphContextTokens?: unknown;
 	};
 	const settings: ChatSettings = {};
 	if (raw.model !== undefined) {
@@ -57,23 +56,10 @@ export function parseSettingsBody(body: unknown): SettingsBodyResult<ChatSetting
 		}
 		settings.thinkingLevel = raw.thinkingLevel as ThinkingLevel;
 	}
-	// Graph context injection budget (vision-context-injection.md): integer
-	// tokens, 0 (off) to GRAPH_CONTEXT_TOKENS_MAX, no silent clamping — the
-	// slider is the only writer, and it only ever sends multiples of the step.
-	if (raw.graphContextTokens !== undefined) {
-		if (
-			typeof raw.graphContextTokens !== "number" ||
-			!Number.isInteger(raw.graphContextTokens) ||
-			raw.graphContextTokens < 0 ||
-			raw.graphContextTokens > GRAPH_CONTEXT_TOKENS_MAX
-		) {
-			return {
-				ok: false,
-				error: `graphContextTokens must be an integer between 0 and ${GRAPH_CONTEXT_TOKENS_MAX}`,
-			};
-		}
-		settings.graphContextTokens = raw.graphContextTokens;
-	}
+	// Wave 7 killed the graph-context injection (owner: zero configuration
+	// beyond chat models — the prober reads its map through tools now); its
+	// budget dial is gone with it. A stale client sending the old key has
+	// it silently dropped here (forward-compatible, like any unknown key).
 	return { ok: true, settings };
 }