Wave 7 close-out: the embedding ledger seam dies; notes birth via mapping lines

Part 1 — the ledger + remnants interlude (master-dispatched, owner ruling
2026-09-23: nothing configures the graph beyond chat models):

- The embedding ledger surface is gone: readEmbeddings/writeEmbeddings
  ports, the EmbeddingsLedger contract, EMBEDDINGS_FILE (config, store
  impls, graphRevision source list), and graph-deletion's vector-pruning
  step. On-disk data files stay untouched (inert history).
- The extraction embedder seam dies wholesale: ExtractionPipelineDeps
  drops the embedder dep (chat-handler + backfill/import-notes stubs go
  with it), the 'embedding' phase leaves ExtractionPhase, the usage
  capture/persist helpers die, and stages.embedding leaves
  ExtractionRunUsage (historical records keep their shape — reads are
  lenient). Extraction is two stages again, like the local-embedder era.
- Consumer-less remnants: latestQuizOutcomes + QUIZ_EVENT_KINDS,
  clusterContentId, matchClusterLabelings + Community + ClusterLabeling,
  the readClusterLabels/appendClusterLabel port seams + store impls +
  LEDGER_FILES.clusterLabels. NamingRunUsage/readNamingRuns STAY
  (standing ruling — the cost pill renders historical naming spend);
  clusterHue + MIN_CLUSTER_SIZE stay (live).
- The 'labeler' role dies: BACKGROUND_MODEL_ROLES, ROLE_SLOT, ModelRole,
  the catalog pin projections, and the UI roster strings. RolePins keys
  shrink with the union.

The notes birth fallback (owner-approved 2026-09-23, surfaced by the
interlude's live smoke: production notes imports create provenance-EMPTY
nodes (importNotes passes messages: null — the file's anchor is the
mapping line), so the provenance-only birth rule left every imported
file unclustered and invisible to the prober's session list, against the
locked file-birth ruling. A provenance-empty node now births under its
FIRST mapping line's chatId (ledger order); only notes-born nodes ever
hit the fallback (chat nodes always carry provenance; a re-encountered
node's link-append re-opens the provenance rule). Deletion-safe: mapping
lines of deleted chats are stripped alongside their provenance.

Live-verified on port 3004: a fresh notes import clusters under its
src_ id with the file path as the label, end to end with no embedder.

845/845 tests, typecheck/lint/build green.
EOF
)

tests/settings-resolution.test.ts

@@ -97,22 +97,22 @@ describe("resolveSettings", () => {
 	it("resolveModelSpec is field-independent per override aspect", () => {
 		const slots = { cheap: { model: { provider: "zai", id: "slot-model" }, thinkingLevel: "high" as const } };
 		assert.deepEqual(
-			resolveModelSpec("labeler", { model: { provider: "other", id: "x" } }, slots),
+			resolveModelSpec("auditor", { model: { provider: "other", id: "x" } }, slots),
 			{ provider: "other", id: "x", thinkingLevel: "high" }, // override model + slot level
 		);
-		assert.deepEqual(resolveModelSpec("labeler", { thinkingLevel: "max" }, slots), {
+		assert.deepEqual(resolveModelSpec("auditor", { thinkingLevel: "max" }, slots), {
 			provider: "zai",
 			id: "slot-model",
 			thinkingLevel: "max", // override level + slot model
 		});
-		assert.equal(resolveModelSpec("labeler", undefined, {}), undefined);
+		assert.equal(resolveModelSpec("auditor", undefined, {}), undefined);
 	});
 });
 
 describe("the slot tier (BYOK, owner 2026-09-22)", () => {
 	it("slot alone re-tiers every role of its tier (no role overrides present)", () => {
 		const eff = resolveSettings({ version: 1, models: { cheap: { model: { provider: "zai", id: "glm-5.3-flash" } } } });
-		for (const role of ["researcher", "demoBuilder", "extractor", "auditor", "labeler"] as const) {
+		for (const role of ["researcher", "demoBuilder", "extractor", "auditor"] as const) {
 			assert.deepEqual(
 				eff.agent.models[role],
 				{ provider: "zai", id: "glm-5.3-flash", thinkingLevel: undefined }, // level unset → default order
@@ -134,7 +134,7 @@ describe("the slot tier (BYOK, owner 2026-09-22)", () => {
 			id: "r-override",
 			thinkingLevel: "high", // slot level rides the override's model
 		});
-		assert.deepEqual(eff.agent.models.labeler, { provider: "zai", id: "r-slot", thinkingLevel: "high" });
+		assert.deepEqual(eff.agent.models.auditor, { provider: "zai", id: "r-slot", thinkingLevel: "high" });
 	});
 
 	it("vision slot covers visualMaker AND pdfReader; level-only slots resolve as NULL", () => {