feat: journal strict task consumption before native fixture effects

Assistant: codex
Assistant-Model: gpt-6-astra
Assistant-Session: 01a140c4-354a-7823-8f0d-8f717397f786

workplans/RPF-WP-0035-credential-lane-implementation.md

@@ -1262,3 +1262,18 @@ bodies before a native fixture can materialize. Proposed source records gain no
 execution authority; no real grant, policy or legacy applier registration added.
 Details and remaining production gates: docs/task-execution-grant-projection.md.
 T12 remains progress; no owner sync or production effect performed by this package.
+
+2026-10-16 T12 fourth source package: connected the Secrets-owned strict task
+handoff to actual Approval ExecutionConfirmationClient independent GET before
+consume-confirmed/native fixture work. Platform accepts no supplied authorization
+boolean/object/callback and preserves its exact owner descriptor/grant/Plan join.
+Durable CAS/GET intents precede native ordinals through the repaired journal
+prefix API. Actual source-server fixture uses signed Access/enforced synthetic
+TokenReview, real Approval WSGI/SQLite with distinct synthetic human/service
+identities, actual strict Secrets signature/CAS validation and disposable native
+OpenBao. Untouched actual task policy remains signed DENY; separately named
+synthetic fixture policy is never production admission. Read-scope denial after
+CAS records consumed/unknown with zero native effects. Exact dependency/source
+hashes, tests and remaining gates are retained with the source package and in
+docs/task-execution-mediator-seam.md. No real grant/custody, policy default, owner
+sync or native production acceptance is performed; T12 stays progress.