`[2026-07-13]` **Resumed-session context-snapshot is IN-MEMORY → lost on a container recreate (agent_not_available on resume).** During the #355 re-drive, soong's fresh drive 409'd `agent_not_available`. Root cause (after ~4 refinements — agent-loss? zombie turn-lock? stale-sessions-hold-agent? → the actual mechanism): `get_agent_context_for_session` returns the agent snapshot recorded AT SESSION-CREATE, held in-memory; a pre-recreate session resumed on b60/b61 has no snapshot → None → 409. (Compounding: stale `'active'` sessions left un-terminated by the old no-terminal bug HOLD the agent, blocking new creates too.) Deploy-grounding was healthy the whole time (`registry.resolve("char-rp-reasoning")` OK) — the config/grant hypotheses were all red herrings. Fix = a FRESH session (a studio-service restart re-records the snapshot); pre-recreate sessions need retiring. Tracked **WT #356**. **For any run: create a fresh session, never resume a pre-recreate one; `agent_not_available` on a fresh create = this gap.** (Working-style note: I over-relayed the intermediate root-cause churn to the operator — for a peer-owned block being actively diagnosed, hold until it settles.)
