fix(server): support Prime Agent 0.8.0

[rynfar]

Prime Agent 0.8.0 keeps daemon protocol 7 but advances the schema to 22 and changes recovery, RLM roster, ACP completion, and process-isolation behavior. Without adaptation, recovered Pylon-owned workers could lose runtime context, ACP turns could settle before descendants, and nested harness state could leak into newly launched Prime processes.

This change:

• supplies fresh client-owned worker recovery configuration and keeps model/thinking selections current;
• uses the authoritative 0.8 RLM roster with strict bounded decoding and an older-version fallback;
• consumes correlated ACP terminal-quiescence metadata and fails closed on invalid correlation;
• removes private Prime worker variables and RLM_DEPTH from both daemon and ACP roots without removing public configuration;
• records explicit integrate/defer decisions for every schema 17–22 capability and documents the 0.8 MCP migrations.

Verification:

• 258 focused Prime/ACP tests
• server typecheck
• targeted lint and format checks
• opt-in real-daemon integration against published Prime Agent 0.8.0 (real turn, cancellation, restart/resume, and cleanup)
• two separate direct review passes

Implemented and reviewed with OpenAI GPT-5.4 via Prime Agent.

---

^{Need help on this PR? Tag @codesmith with what you need. Autofix is disabled.}

[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	13.4 KiB	13.4 KiB	−7 B (−0.1%)	15.1 KiB	✅
Codex	Thread snapshot wire	6.9 KiB	6.9 KiB	+6 B (+0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.5 KiB	6.5 KiB	−13 B (−0.2%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	55.0 KiB	55.0 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	16	16	0 (0.0%)	21	✅
Claude	Total thread wire	13.5 KiB	13.4 KiB	−8 B (−0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	6.9 KiB	6.9 KiB	−1 B (−0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.6 KiB	6.6 KiB	−7 B (−0.1%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	55.8 KiB	55.8 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	16	16	0 (0.0%)	21	✅

Baseline: fe83b3c · PR result: 8feb38c · 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: 109.4 KiB
• Claude decoded thread snapshot: 110.0 KiB

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