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

tests/layout.test.ts

@@ -108,7 +108,6 @@ describe("settleGraphLayout", () => {
 		const store = {
 			readNodes: () => lines.map((l) => ({ ...l })),
 			readEdges: () => [edge("a", "b")],
-			readMappings: () => [],
 			readPositions: () => ({} as Record<string, Position>),
 			writePositions: (p: Record<string, Position>) => void written.push(p),
 		};
@@ -122,7 +121,6 @@ describe("settleGraphLayout", () => {
 		settleGraphLayout({
 			readNodes: () => [],
 			readEdges: () => [],
-			readMappings: () => [],
 			readPositions: () => ({} as Record<string, Position>),
 			writePositions: (p) => void written.push(p),
 		});