§2 — P1: Deprecation architecture (accepted names only) ✓ landed 2026-07-10

Quick status

Item	Status	Commit
Export-time deprecation stubs + chain collapse + status mapping	✓ shipped	`bb76411e` (codex)
Stage-at-supersession recording (both supersede sites)	✓ shipped	`bb76411e` (codex)
ISN stub validation + successor-forward rendering	✓ shipped	`d5d3687` (ISN)
sn merge round-trip preserves stubs	✓ shipped (tested)	`bb76411e` (codex)

What shipped

Export stubs (export.py: _fetch_deprecation_stubs + _build_stub_entry): every superseded name that had reached the published bar emits a status: deprecated stub with superseded_by = the live successor resolved along the REFINED_FROM* chain — chains collapse A→B→C to a single A→C stub; successors outside the published set are skipped (no dangling pointers). Exported accepted names publish status: active (decision d-status-mapping); draft leaves the published vocabulary. deprecated_stub_count lands in .export_report.json only — the catalog manifest model stays closed.
Stage recording (graph_ops.py, +24): superseded_from_stage written at both supersede sites. Drift adaptation: persist_refined_name cannot see the name-axis stage (edit.py flips the predecessor to refining before persist), so it records the durable published proxy docs_stage='accepted' — stricter than the letter of the decision: a stub is emitted only for names that actually reached consumers; accepted-but-never-published renames emit nothing (decision d-dep-scope honoured in spirit and effect).
ISN side: models + SQLite schema already carried deprecated/superseded_by; added the structural rule (deprecated ⇒ superseded_by present; resolution itself is P3's semantic check) and successor-forward fields in tools/fetch.py. Round-trip test proves stubs persist across build/read.
sn merge (post-catalog-import architecture): read_pr_changes leaves unchanged stubs alone; docs edits on live names still flow.

Verification

Test classes required by done-when all green: accepted rename → stub; draft rename → no stub (superseded_from_stage='accepted' Cypher gate); chain collapse; ISN validate on stub-bearing catalog; merge preserves stubs. Orchestrator re-ran independently: 17 passed (codex) + 5 passed (ISN).
Full suites at HEAD: ISN 1683 passed / 0 failed (the 3 failures P1 saw mid-flight were P3's in-progress semantic.py state, since fixed). Codex blast-radius 130 passed / 1 pre-existing graph-marked failure (test_escalation_at_final_attempt: RefinedName now requires segments; fixture drift predates P1, folded into P6).
Scope audit: commits touch exactly the allocated files; no AI trailers.