delete the mappings ledger — per-job in-memory resolution + notes fingerprint guard

The persisted (chatId, sourceId)→node table was a shared namespace across
independent chunk/batch jobs: each chunk's extractor mints local ids fresh
(p1..pN), so later chunks collided with earlier ones — propositions silently
skipped as 'already resolved' (coverage checkpointed anyway: permanent silent
loss) and edges resolved onto the wrong nodes (the 'everything links to
everything' mush). Owner ruling 2026-09-29: mergeFindings resolves THIS job's
ids in memory, nothing persists between jobs; cross-job identity is the
auditor's linkTo verdicts alone.

- contracts: NodeMapping dies; NotesSource.contentFp — sha256 of the text at
  the last run, the re-import guard (unchanged re-import = TRUE no-op, no
  model calls, no usage; changed text re-runs; legacy unstamped sources
  re-run once)
- merger: job-local resolution map, in-submit duplicate ids skip once,
  edges resolve extractor-local ids only
- ports/store: appendMapping/readMappings, LEDGER_FILES.mappings,
  rewriteLedgers.mappings gone (stale data/graph/mappings.jsonl just stops
  being read)
- session-clusters: birthSessionOf is provenance-only — the legacy
  mapping-line fallback for provenance-empty notes nodes dies
- deletion: no mapping rows to strip; stats lose mappingsRemoved
- replay-layout batches nodes by first provenance point
- graph.test pins the new independence semantics (re-merge re-creates;
  duplicate ids within one submit resolve once); extraction tests pin
  per-chunk merges + the fingerprint guard

src/core/ports.ts

@@ -19,7 +19,6 @@ import type {
 	JobKind,
 	JobRecord,
 	ExtractionRunUsage,
-	NodeMapping,
 	PlanTree,
 	Position,
 	CoverageEntry,
@@ -84,10 +83,6 @@ export interface GraphStore {
 
 	/** Append one quiz outcome / understanding observation. */
 
-	/** Append one identity-map line (chat's tree node → graph node). */
-	appendMapping(mapping: NodeMapping): void;
-	readMappings(): NodeMapping[];
-
 	/** Append one emission checkpoint. */
 	appendCheckpoint(checkpoint: SessionCheckpoint): void;
 	readCheckpoints(): SessionCheckpoint[];
@@ -127,7 +122,6 @@ export interface GraphStore {
 	rewriteLedgers(next: {
 		nodes?: GraphNode[];
 		edges?: GraphEdge[];
-		mappings?: NodeMapping[];
 		coverage?: CoverageEntry[];
 		checkpoints?: SessionCheckpoint[];
 	}): void;