fix(prime): stop delivered work and preserve recovered answers

[rynfar]

Native Prime could keep executing after Stop because lifecycle cancellation only removes prompts before delivery. After a server restart, it could also display “finished without sending a final response” beside a valid answer because recovered run messages were merged out of order.

Stop now requests one abort for the proved owned session when the exact lifecycle is still delivered. The command cannot be replayed across reconnection, lost ownership or lifecycle proof fails closed, and the authoritative terminal lifecycle still controls settlement. Recovered run messages retain their original order so older tool calls do not displace the final answer.

Validation: 463 focused adapter/runtime/event tests pass, including before/after regressions for both defects and negative cancellation/terminal-response cases. Server typecheck and scoped lint/format checks pass. The same final acceptance checkpoint reviewed all six files and passed. A real delivered-tool Stop returned to the composer in 0.417 seconds with no alert; the original failure took 48.634 seconds and continued executing. Recovery and final client acceptance evidence are being completed on this change.

Model: GPT-6; harness: Codex.

[vercel]

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Project	Deployment	Actions	Updated
pylon-marketing	Ready	Preview	Sep 12, 2026 3:55am UTC

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	13.9 KiB	13.9 KiB	−1 B (−0.0%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.2 KiB	7.2 KiB	−5 B (−0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.7 KiB	6.7 KiB	+4 B (+0.1%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	58.0 KiB	58.0 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	8	8	0 (0.0%)	21	✅
Claude	Total thread wire	14.1 KiB	14.1 KiB	+13 B (+0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.2 KiB	7.2 KiB	−4 B (−0.1%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.9 KiB	6.9 KiB	+17 B (+0.2%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	59.7 KiB	59.7 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	10	10	0 (0.0%)	21	✅

Baseline: fe26e47 · PR result: ed51aab · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 115.6 KiB
• Claude decoded thread snapshot: 116.3 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.