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.

tests/model-catalog.test.ts

@@ -117,10 +117,10 @@ describe("the model catalog projection", () => {
 		const partial = catalogDefaultsFor({ model: { provider: "openrouter", id: "qwen/qwen3.8-flash" } }, strong);
 		assert.ok(partial);
 		assert.equal(partial!.thinkingLevel, "low");
-		// graphContextTokens-only record: model untouched
-		assert.deepEqual(catalogDefaultsFor({ graphContextTokens: 512 }, strong), {
+		// thinkingLevel-only record: model untouched
+		assert.deepEqual(catalogDefaultsFor({ thinkingLevel: "minimal" }, strong), {
 			model: { provider: "openrouter", id: "z-ai/glm-5.3-flash" },
-			thinkingLevel: "low",
+			thinkingLevel: "minimal",
 		});
 		// chat.model with NO strong slot: the conversation runs on it alone
 		assert.deepEqual(