[houlianpi]

Changes

• Require successful post-interruption observation of the exact created session identity before every DELETE attempt.
• Reject late, equal-timestamp, empty, wrong-identity, and unsuccessful reconciliation evidence.
• Isolate the response-pending regression with timeout=1 and before/at/after boundary cases.
• Record verification evidence in docs/HANDOFF.md. No Runtime changes.

Verification

• Focused evaluator and process-boundary regressions: 112 passed.
• Actual local HTTP fixture: query-before-delete accepted; delete-before-query rejected.
• In-memory removal of the pending guard detected by both non-pending cases.
• Independent read-only review: no actionable findings.
• Lock check, repository-wide Ruff format/check, Mypy, and build passed.
• Full local suite: 810 passed, 2 failed in tests/test_release.py. Failures correspond to pre-existing local staged deletions of retained evidence and the local .gitignore modification; neither is included in this branch. Hosted CI must verify the committed tree.

Related to #98. This does not close outstanding actual-platform acceptance.