[aruintelligence]

Change

• Add an optional host policyEpoch() to the four receipt-bound adapters. Its nonnegative safe integer is included in the signed receipt and rechecked after approval and before dispatch. A change or unavailable value suppresses dispatch and spends the grant; integrations without the option keep their receipt format.
• Add four deterministic, project-authored A→B→A comparisons and a checked-in report: four callbacks without the epoch, zero with the epoch, four blocked approval crossings, and four unchanged controls that dispatch.
• Append four receipts to the chain registry (508 total), add report and source to the reproducible manifest, CI, and publication notes.

Verification

• npm test: 1,090 passed, 0 failed
• bash reproduction/action-boundary/reproduce.sh: passed
• node scripts/verify-action-receipt-registry.mjs --check --append-only-base HEAD before commit: 508 entries, previous 504 unchanged
• npm run check:links: 423 Markdown files passed
• git diff --check: clean

The epoch comparison uses in-memory host state and local callbacks. A production host must persist a monotonic epoch and increment it for policy and destination-mapping changes; this change does not prove that external behavior.