fix(rm-02): narrow inventory drift guarantee

docs/remediation/GATE-CLAIMS.md

@@ -24,6 +24,14 @@ This index binds remediation claims that live in orchestrator-owned `TASKS.md` w
 - Anchored text: “SELF-VERIFICATION BY THE AUDITED PARTY IS NOT VERIFICATION.”
 - Dependency: RM-60/#1031, cross-referenced with RM-59.
 
+## Same-checkout inventory drift boundary
+
+<!-- GATE-CLAIM:INVENTORY-DRIFT-BOUNDARY -->
+
+- Source: RM-02 ruling after D-48/CWE-353 reproduced against the round-4 baseline.
+- Boundary: Detects accidental and incompetent inventory drift within a checkout; does NOT survive an adversary who rewrites baseline, manifest, and verifier consistently — that guarantee requires RM-60's external boundary.
+- Negative control: `checkout-preflight/inventory-claim-overstatement` rewrites the boundary as protection and must go red.
+
 ## Criterion restatement provenance
 
 <!-- GATE-CLAIM:CRITERION-RESTATEMENT -->