docs(09-02): complete auto-assign range update plan

.planning/STATE.md

@@ -2,15 +2,15 @@
 gsd_state_version: 1.0
 milestone: v1.2
 milestone_name: Extended Protocol Coverage
-status: verifying
-stopped_at: Phase 9 context gathered
-last_updated: "2026-03-27T12:45:39.811Z"
+status: executing
+stopped_at: Completed 09-02-PLAN.md (auto-assign range update)
+last_updated: "2026-03-27T13:09:48.759Z"
 last_activity: 2026-03-27
 progress:
   total_phases: 4
   completed_phases: 1
-  total_plans: 1
-  completed_plans: 1
+  total_plans: 3
+  completed_plans: 2
   percent: 0
 ---
 
@@ -21,13 +21,13 @@ progress:
 See: .planning/PROJECT.md (updated 2026-03-27)
 
 **Core value:** Network traffic patterns are instantly recognizable as distinct sounds — a ping sounds different from HTTPS noise, which sounds different from a port scan.
-**Current focus:** Phase 08 — test-and-constant-cleanup
+**Current focus:** Phase 09 — frequency-design-and-group-architecture
 
 ## Current Position
 
-Phase: 9
-Plan: Not started
-Status: Phase complete — ready for verification
+Phase: 09 (frequency-design-and-group-architecture) — EXECUTING
+Plan: 2 of 2
+Status: Ready to execute
 Last activity: 2026-03-27
 
 Progress: [░░░░░░░░░░] 0%
@@ -50,6 +50,7 @@ Progress: [░░░░░░░░░░] 0%
 
 **Recent Trend:** Stable
 | Phase 08 P01 | 1 | 2 tasks | 2 files |
+| Phase 09 P02 | 3 | 2 tasks | 2 files |
 
 ## Accumulated Context
 
@@ -63,6 +64,7 @@ Progress: [░░░░░░░░░░] 0%
 - [Phase 07]: LoadResult struct chosen over tuple return for config.Load() — cleaner API contract
 - [Phase 08]: NumLayers and GainPerLayer deleted — dead code since NewBank computes gain dynamically as 1/N
 - [Phase 08]: TestFrequenciesInRange now validates against Nyquist (22050 Hz) — any new BaseHz in (0, 22050) is accepted without test surgery
+- [Phase 09]: autoAssignFreq range moved to [2500, 4000] Hz with numSteps=31 to guarantee no collision with built-in frequencies (max 2449 Hz)
 
 ### Pending Todos
 
@@ -75,6 +77,6 @@ Progress: [░░░░░░░░░░] 0%
 
 ## Session Continuity
 
-Last session: 2026-03-27T12:45:39.804Z
-Stopped at: Phase 9 context gathered
-Resume file: .planning/phases/09-frequency-design-and-group-architecture/09-CONTEXT.md
+Last session: 2026-03-27T13:09:48.752Z
+Stopped at: Completed 09-02-PLAN.md (auto-assign range update)
+Resume file: None