add docs/governance/BUILD_RECEIPTS.md — commit ledger with claim boundaries

Added a ledger of verified commits and claim boundaries for commit-gate-core, detailing changes, held claims, and not held claims.

Author: LalaSkye

docs/governance/BUILD_RECEIPTS.md

@@ -0,0 +1,53 @@
+# BUILD RECEIPTS
+
+Ledger of verified commits and claim boundaries for commit-gate-core.
+
+---
+
+## a624c970
+
+**Change:** README now exposes the local adversarial verifier command.
+
+**Held:**
+- Local proof path is discoverable from README
+- Adversarial verifier is present and runnable
+- Claim discipline is exposed from entry
+- CI workflow is committed
+
+**Not held:**
+- CI green proof
+- Connector-visible workflow success
+- Verified enforcement on every push
+
+**Safe claim:**
+The repo now exposes both the execution demo and the adversarial verification path from its primary entry surface.
+
+---
+
+## f56d9588
+
+**Change:** `scripts/verify_adversarial_invariants.py` added — local executable verifier for adversarial proof obligations.
+
+**Held:**
+- Local verification path exists
+- ADV-I / ADV-II / ADV-III evaluation present
+- PASS / FAIL receipts printed to stdout
+- Exits non-zero on invariant divergence
+
+**Not held:**
+- CI green proof
+- Connector-visible workflow success
+
+**Safe claim:**
+Local verification path exists. CI enforcement remains configured but not yet evidenced green.
+
+---
+
+## Claim boundary (standing)
+
+Local verification is present and discoverable.
+CI enforcement remains configured but not yet evidenced green.
+
+---
+
+*This ledger records verified state only. No claim is held until it is evidenced.*