data/audit/x11-phase2-backfill-20260601.md

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+# X11 Phase 2 — Corroboration Backfill (2026-06-01)
+
+`corroboration.build_all()` over the full corpus after wiring the approval gate.
+
+## Result
+```
+{"precedents": 12, "citations": 26, "linked": 20, "approved": 0, "demoted": 0}
+```
+
+## Treatment distribution (20 stored links)
+- followed: 18 · explained: 1 · mentioned: 1 · **negatives: 0**
+
+## Per-halacha corroboration
+- 14 halachot carry corroboration rows; **4 are corroborated** (≥2 distinct positive sources, 0 negatives).
+- **All 14 were already `approved`** (13 by confidence ≥0.80, 1 by דפנה).
+
+## Why 0 approved / 0 demoted (correct, not a bug)
+- **0 approved:** `approve_halacha_by_corroboration` only transitions `pending_review`. Every corroborated halacha was already approved → nothing to promote this run. The citation-corroboration set currently **fully overlaps** the confidence-approved set.
+- **0 demoted:** the corpus has **no negative treatments** → nothing overruled to demote.
+
+## Verification
+- Counts before == after (approved=1415, pending=196, published=0, rejected=1) — idempotent, no chair-final state touched.
+- Approve path proven end-to-end in a **rolled-back transaction**: a corroborated halacha set to `pending_review` flipped back to `approved` with reviewer `corroborated (2 judicial citations ≥ 2)`; prod row restored.
+
+## Going-forward value
+The corroboration approval path matters for (a) future halachot extracted **below** the confidence threshold but **citation-corroborated**, and (b) **overruled-demotion** once negative treatment appears in the citation graph. Re-runnable anytime via the `corroboration_rebuild` MCP tool (empty arg = full backfill).