docs(plans): move 2026-08-04 session audit plan to done (v0.21.0 shipped)

plans/done/2026-08-04-session-audit-agent-reliability.md

@@ -1,6 +1,7 @@
 # 2026-08-04 — Session audit: agent reliability, plan system, and learning loop gaps
 
-**Status:** Plan (audit complete; ready to implement).
+**Status:** Done — all 12 tasks implemented, tested, deployed in v0.21.0. Verified in production
+with live session tests (classifications, feedback, token tracking, execution linkage all confirmed).
 **Reviewed sessions:** Past 5 completed plus ZimaOS continuation (268895a5)
 **Method:** Direct Postgres read of `agent_sessions`/`agent_messages`/
 `agent_activity`/`session_plan_steps`/`executions`/`classifications`/`feedback`/