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
)

src/core/ports.ts

@@ -27,9 +27,7 @@ import type {
 	SessionCheckpoint,
 	TurnUsage,
 	NotesSource,
-	ClusterLabeling,
 	NamingRunUsage,
-	EmbeddingsLedger,
 } from "./contracts.ts";
 import type { UserSettings } from "./settings.ts";
 
@@ -102,11 +100,6 @@ export interface GraphStore {
 	appendCoverage(entry: CoverageEntry): void;
 	readCoverage(): CoverageEntry[];
 
-	/** Append one cluster labeling — idempotent by id (the id hashes the
-	 *  sorted core, so identical member sets dedupe). */
-	appendClusterLabel(labeling: ClusterLabeling): void;
-	readClusterLabels(): ClusterLabeling[];
-
 	/** Append one cluster-naming run's usage (graph-global money channel) —
 	 *  idempotent per startedAt. */
 	appendNamingUsage(entry: NamingRunUsage): void;
@@ -128,16 +121,6 @@ export interface GraphStore {
 	/** Replace the whole ledger (the settle is a full-graph computation). */
 	writePositions(positions: Record<string, Position>): void;
 
-	/** The embeddings ledger (config.EMBEDDINGS_FILE) — INERT DATA since
-	 *  wave 7 (owner ruling 2026-09-23: the provider embedder is dead;
-	 *  clustering is birth-session, labels are session names; the
-	 *  graph-context injection is gone with it). The whole seam dies in
-	 *  the follow-up interlude; graph-deletion's vector pruning is
-	 *  harmless housekeeping meanwhile. */
-	readEmbeddings(): EmbeddingsLedger;
-	/** Replace the whole ledger (graph-deletion's vector pruning only). */
-	writeEmbeddings(ledger: EmbeddingsLedger): void;
-
 	/** THE DESTRUCTIVE SEAM (session-deletion wave 6, owner 2026-09-22 —
 	 *  the first non-append operation on these ledgers): atomically
 	 *  replace the full contents of any subset of the six rewritable