diff --git a/docs/operator-guide.md b/docs/operator-guide.md
index bff5f278..3448f99d 100644
--- a/docs/operator-guide.md
+++ b/docs/operator-guide.md
@@ -269,8 +269,9 @@ fixture; it is not a complete proof of production safety.
 For the separate legacy-data maintenance procedure, use the [legacy leakage
 scrub runbook](operators/legacy-leakage-scrub-v1.md). It requires a dedicated
 admin PostgreSQL connection and a private 32-byte HMAC key. The PostgreSQL
-proof, Redis credential-revocation proof, and complete cross-sink proof are
-separate gates; do not treat one as evidence for the others.
+scrub proof, Redis purge proof, and Redis ACL proof are each necessary, but
+none alone proves that the supported production sinks share one safe boundary.
+The mandatory combined cross-sink proof below is a separate release gate.
 
 ### Redis task-event cutover
 
@@ -377,8 +378,34 @@ FORGE_S4_REDIS_ACL_TEST_REQUIRED=1 FORGE_S4_REDIS_ACL_DESTRUCTIVE_TEST=1 \
 # S4_REDIS_ACL_LEGACY_REVOKED_OK
 ```
 
-These are separate gates. Passing them does not claim the deferred complete
-cross-sink production proof.
+These are separate gates. Passing them does not replace the mandatory combined
+cross-sink proof below.
+
+#### Combined cross-sink production proof
+
+The mandatory combined CI proof is
+`cross-sink-production-sentinel.postgres-redis.test.ts`. It must pass exactly
+1/1 and emit `S4_CROSS_SINK_PRODUCTION_SENTINEL_OK`. It composes the real
+production writers, readers, routes, projections, and scrub adapters against
+disposable PostgreSQL and Redis services, then checks the supported sink set
+collectively:
+
+- canonical `tasks.prompt` authorization;
+- task API projections;
+- logs and export;
+- Server-Sent Events live, snapshot, and replay;
+- Redis history, sequence, and live data;
+- worker diagnostics;
+- the scrubbed database inventory;
+- the signed producers-disabled receipt;
+- zero-scan and reappearance checks; and
+- legacy Redis ACL revocation.
+
+This is exact hosted disposable-service release evidence. It is not a
+production deployment, not proof for arbitrary future producers or sinks, and not proof of correctness. Any new producer or sink must extend the proof
+corpus and inspection before relying on this marker. It does not imply that
+the future specialist, ACP, or three-lease execution lifecycle is implemented
+or enabled.
 
 #### Rollback-safe handling
 
diff --git a/docs/operators/legacy-leakage-scrub-v1.md b/docs/operators/legacy-leakage-scrub-v1.md
index 72fe4452..e7055154 100644
--- a/docs/operators/legacy-leakage-scrub-v1.md
+++ b/docs/operators/legacy-leakage-scrub-v1.md
@@ -195,8 +195,35 @@ The test must report all tests passed with zero skips and emits these markers:
 
 That proof covers the PostgreSQL authorization, row/checkpoint compare-and-set,
 resume, reappearance, and protected-artifact link-race contracts. It does not
-claim the separate Redis credential-revocation/namespace proof or the complete cross-sink production proof.
-Those are later gates and must be run and reviewed separately.
+claim the separate Redis credential-revocation/namespace proof or the combined
+cross-sink production boundary by itself. Those are separate gates and must be
+run together through the mandatory proof below.
+
+## Combined cross-sink production proof
+
+The mandatory combined CI proof is
+`cross-sink-production-sentinel.postgres-redis.test.ts`. It must pass exactly
+1/1 and emit `S4_CROSS_SINK_PRODUCTION_SENTINEL_OK`. It composes the supported
+production writers, readers, routes, projections, and scrub adapters against
+disposable PostgreSQL and Redis services and verifies the supported sink set
+collectively:
+
+- canonical `tasks.prompt` authorization;
+- task API projections;
+- logs and export;
+- Server-Sent Events live, snapshot, and replay;
+- Redis history, sequence, and live data;
+- worker diagnostics;
+- the scrubbed database inventory;
+- the signed producers-disabled receipt;
+- zero-scan and reappearance checks; and
+- legacy Redis ACL revocation.
+
+This is exact hosted disposable-service release evidence, not a production
+deployment, not proof for arbitrary future producers or sinks, and not proof of correctness. New producer or sink surfaces must extend the proof corpus and
+inspection before they can rely on this marker. It does not imply that the
+future specialist, ACP, or three-lease execution lifecycle is implemented or
+enabled.
 
 ## Redis ACL and protected-mode cutover
 
@@ -277,7 +304,7 @@ FORGE_S4_REDIS_ACL_TEST_REQUIRED=1 FORGE_S4_REDIS_ACL_DESTRUCTIVE_TEST=1 \
 # S4_REDIS_ACL_LEGACY_REVOKED_OK
 ```
 
-These are separate gates and do not claim the deferred complete cross-sink
+These are separate gates and do not replace the mandatory combined cross-sink
 production proof. Before activation, keep the database mode legacy and do not
 inject the dedicated URLs into running legacy processes while investigating.
 Creating the ACL users and storing their secrets out of process does not select
diff --git a/web/__tests__/legacy-leakage-scrub.test.ts b/web/__tests__/legacy-leakage-scrub.test.ts
index 93573a71..0da97e4a 100644
--- a/web/__tests__/legacy-leakage-scrub.test.ts
+++ b/web/__tests__/legacy-leakage-scrub.test.ts
@@ -1002,7 +1002,26 @@ describe('legacy leakage CLI and operator guide', () => {
       expect(envExample).toContain(envName)
     }
     expect(runbook).toContain('Redis credential-revocation/namespace proof')
-    expect(runbook).toContain('complete cross-sink production proof')
+    expect(runbook).not.toContain(['deferred complete', 'cross-sink production proof'].join(' '))
+    for (const combinedProofContract of [
+      'mandatory combined CI proof',
+      'cross-sink-production-sentinel.postgres-redis.test.ts',
+      'S4_CROSS_SINK_PRODUCTION_SENTINEL_OK',
+      'canonical `tasks.prompt` authorization',
+      'task API projections',
+      'logs and export',
+      'Server-Sent Events live, snapshot, and replay',
+      'Redis history, sequence, and live data',
+      'worker diagnostics',
+      'scrubbed database inventory',
+      'signed producers-disabled receipt',
+      'zero-scan and reappearance checks',
+      'legacy Redis ACL revocation',
+      'not proof for arbitrary future producers or sinks',
+      'not proof of correctness',
+    ]) {
+      expect(runbook).toContain(combinedProofContract)
+    }
     expect(runbook).toContain('schemaVersion: 2')
     expect(runbook).toContain('sentinelSetFingerprint')
     expect(runbook).toContain('legacy_task_log_unavailable')
@@ -1130,7 +1149,9 @@ forge:task-events:v2:* keys.`
       'S4_REDIS_ACL_DENIALS_OK',
       'S4_REDIS_ACL_LEGACY_REVOKED_OK',
     ]) expect(runbook).toContain(proofContract)
-    expect(runbook).toMatch(/deferred complete cross-sink\s+production proof/)
+    expect(runbook).not.toContain(['deferred complete', 'cross-sink production proof'].join(' '))
+    expect(operatorGuide).toContain('cross-sink-production-sentinel.postgres-redis.test.ts')
+    expect(operatorGuide).toContain('S4_CROSS_SINK_PRODUCTION_SENTINEL_OK')
     expect(operatorGuide).toContain('database-authoritative S4 runtime mode')
     expect(operatorGuide).toMatch(/Changing environment values\s+alone cannot flip the mode/)
     for (const aclToken of [