[JGiola]

Plan: plans/traust-standardization/13-artifact-only-sessions/done/01-jacopo-session-contract-and-runner.md

Summary

Forward the claim runner's existing worker identity to artifact-only session commands.

• Supply {worker} from the same self._worker used for claim, heartbeat and completion.
• Keep whole-token argv substitution and the existing execution lifecycle.
• Pin core to merged commit acf67b8a4409ed7afa1b79d7954636b5b169fa64 on development from feat(ops): record artifact-only sessions under the runner lease traust-core#309, which supplies session audit recording and portable manifest/heartbeat serialization.
• Document the placeholder and prove the actual command receives both the claimed order and its worker.

Verification

• make lint-fix and make test: 146 passed, no skips, against the pinned core commit.
• Consumer drift ratchet: passed.
• Independent read-only review of the handoff: no findings.

Parity

Behavior	Result
Claim identity	The existing claiming worker supplies the new token
Heartbeats and completion	Existing identity and lifecycle retained
Command construction	Whole-token argv substitution retained; no shell string
Session evidence admission	The session can pass the actual holder to core rather than infer it from a stored row

Reviewer checks

• {worker} is the claiming runner's identity.
• Claim, heartbeat and completion retain their existing engine flow.
• The dependency pin includes the approved session contracts and core recording behavior.
• Existing refused-result round-trip remains covered with a registered reason.

Quality checklist

• 1. Comments only for the non-trivial
• 2. Short docstrings
• 3. Existing owners reused
• 4. No duplicated worker identity
• 5. Actual command handoff covered
• 6. Real core services exercised by runner tests
• 7. Minimal source change
• 8. No query changes
• 9. Existing fixture value change explicitly approved

Changed tests

Test	Old → new	Why / approval
tests/test_ops_shadow.py::test_outcome	Refused-answer fixture and matching expected value: unregistered "x" → OrderReason.NOT_FOUND	The updated core pin enforces registered reasons; the refusal equality assertion is unchanged. Jacopo explicitly approved this fixture change on 2026-10-30.

• A person reviewed each changed test and the behavior change is intended.

Delivery

Core #309 is merged; this PR pins its merge commit on development. The harness PR consumes this placeholder in below_range_review. Human review required; auto-merge is disabled and this PR must not be merged automatically.

[openshift-ci]

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