docs(02-02): complete doctor overlay validation plan

- SUMMARY.md with task commit, decisions, metrics
- STATE.md: Phase 2 complete (2/2 plans), ready for Phase 3

.planning/STATE.md

@@ -9,16 +9,16 @@
 ## Current Position
 
 **Phase:** 2 — Config Overlays
-**Plan:** 1 of 2 complete (02-01 done)
-**Status:** in_progress
-**Progress:** █████░░░░░ 1/3 phases complete (02-01 of Phase 2 done)
+**Plan:** 2 of 2 complete (02-02 done)
+**Status:** complete
+**Progress:** ███████░░░ 2/3 phases complete
 
 ## Phase Status
 
 | Phase | Status | Plans |
 |-------|--------|-------|
 | 1 — Daemon Decomposition | **complete** | 3/3 plans complete |
-| 2 — Config Overlays | **in_progress** | 1/2 plans complete |
+| 2 — Config Overlays | **complete** | 2/2 plans complete |
 | 3 — Live Ops Dashboard | not_started | — |
 
 ## Performance Metrics
@@ -36,6 +36,8 @@
 | Plan 01-03 tasks | 2/2 |
 | Plan 02-01 duration | 3 min |
 | Plan 02-01 tasks | 2/2 |
+| Plan 02-02 duration | ~1 min |
+| Plan 02-02 tasks | 1/1 |
 
 ## Accumulated Context
 
@@ -56,6 +58,8 @@
 - Overlay merge before env expansion and Zod validation — overlays don't need required fields
 - Arrays in overlays replace (not concat) — explicit override semantics
 - resolveOverlayPath returns path without checking existence — callers decide error handling
+- Doctor overlay check placed after checkConfigExists, before checkConfigParses — natural validation order
+- Skip status when FLYNN_ENV not set — no noise for users without overlays
 
 ### Technical Notes
 - daemon/index.ts now 140 lines — thin composition root: imports → init calls → wire → return DaemonContext
@@ -66,6 +70,7 @@
 - Config loader at src/config/loader.ts, schema at src/config/schema.ts (409 lines)
 - deepMerge + overlay-aware loadConfig in loader.ts; resolveOverlayPath + overlay-aware loadConfigSafe in cli/shared.ts
 - FLYNN_ENV maps to {configDir}/{env}.yaml sibling file; no env = no overlay (backward compatible)
+- checkOverlayExists in doctor.ts: skip (no FLYNN_ENV) / pass (file found) / fail (file missing)
 
 ### TODOs
 _(none)_
@@ -75,9 +80,9 @@ _(none)_
 
 ## Session Continuity
 
-**Last session:** Plan 02-01 (core overlay merge) completed
-**Stopped at:** Completed 02-01-PLAN.md
-**Next action:** Execute Plan 02-02 (doctor overlay validation check)
+**Last session:** Plan 02-02 (doctor overlay validation) completed
+**Stopped at:** Completed 02-02-PLAN.md — Phase 2 complete
+**Next action:** Plan Phase 3 (Live Ops Dashboard)
 
 ---
 *State initialized: 2026-02-09*