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/default-settings.test.ts

@@ -10,7 +10,6 @@
 
 import assert from "node:assert/strict";
 import { describe, it } from "node:test";
-import { GRAPH_CONTEXT_TOKENS_MAX } from "../src/core";
 import { parseSettingsBody } from "../src/server/settings-body.ts";
 
 describe("parseSettingsBody (shared by both settings routes)", () => {
@@ -24,13 +23,11 @@ describe("parseSettingsBody (shared by both settings routes)", () => {
 		const r = parseSettingsBody({
 			model: { provider: "openrouter", id: "z-ai/glm-5.3-flash" },
 			thinkingLevel: "high",
-			graphContextTokens: 256,
 		});
 		assert.ok(r.ok);
 		assert.deepEqual(r.settings, {
 			model: { provider: "openrouter", id: "z-ai/glm-5.3-flash" },
 			thinkingLevel: "high",
-			graphContextTokens: 256,
 		});
 	});
 
@@ -54,12 +51,4 @@ describe("parseSettingsBody (shared by both settings routes)", () => {
 		assert.equal(parseSettingsBody({ thinkingLevel: 7 }).ok, false);
 	});
 
-	it("rejects out-of-range or non-integer graphContextTokens — never clamps", () => {
-		for (const bad of [-1, GRAPH_CONTEXT_TOKENS_MAX + 1, 64.5, "256"]) {
-			const r = parseSettingsBody({ graphContextTokens: bad });
-			assert.equal(r.ok, false, String(bad));
-		}
-		const ok = parseSettingsBody({ graphContextTokens: GRAPH_CONTEXT_TOKENS_MAX });
-		assert.equal(ok.ok, true);
-	});
 });