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/pi/record-adapter.ts

@@ -1,8 +1,7 @@
 import type { UIMessage } from "ai";
 import type { AgentMessage } from "@earendil-works/pi-agent-core";
 import type { AssistantMessage, Message, ToolResultMessage } from "@earendil-works/pi-ai";
-import { graphContextOfMessage } from "../../core/graph-context.ts";
-import { graphContextText, HANDOFF_TEXT, verdictText } from "../../core/contracts/chat.ts";
+import { HANDOFF_TEXT, verdictText } from "../../core/contracts/chat.ts";
 
 /**
  * The record → pi-ai transcript adapter (docs/pi-engine-swap.md §4). The
@@ -62,13 +61,6 @@ function systemTextOf(message: { parts: ReadonlyArray<{ type: string; data?: unk
 			return verdictText((part.data as { accepted?: unknown } | undefined)?.accepted === true);
 		}
 		if (part.type === "data-probe-handoff") return HANDOFF_TEXT;
-		// Graph context injection: the block text derives from the part's
-		// validated data (parse-don't-cast — a malformed part has no model
-		// face, and the message then never reaches the provider).
-		if (part.type === "data-graph-context") {
-			const data = graphContextOfMessage({ parts: message.parts });
-			return data ? graphContextText(data) : null;
-		}
 	}
 	return null;
 }