docs: start milestone v1.1 Custom Sound Mappings

.planning/PROJECT.md

@@ -34,14 +34,14 @@ All 16 v1 requirements validated. Full pipeline working: capture -> classify ->
 
 ### Active
 
-(None — next milestone requirements TBD)
+(See REQUIREMENTS.md for v1.1 requirements)
 
 ### Out of Scope
 
-- Real-time audio playback — v1 is file output only
+- Real-time audio playback — file output only
 - GUI or web interface — CLI only
-- Custom sound mapping configuration — predefined + auto-cluster only
 - Rhythmic/percussive output — ambient/drone style only
+- Stereo position configuration — v1.1 focuses on frequency, waveform, and custom rules
 
 ## Context
 
@@ -73,9 +73,33 @@ All 16 v1 requirements validated. Full pipeline working: capture -> classify ->
 | Ordered []Rule classifier over switch | Configurable, extensible, first-match-wins semantics | Good |
 | 500ms window duration | Balances temporal resolution against snapshot frequency for synthesis | Good |
 
+## Current Milestone: v1.1 Custom Sound Mappings
+
+**Goal:** Users can customize how traffic sounds via a TOML config file
+
+**Target features:**
+- Custom frequency per traffic class (override built-in Hz values)
+- Custom waveform per class (sine, square, sawtooth, triangle)
+- User-defined classification rules with custom sounds
+- Auto-discover config from ./netsynth.toml or ~/.config/netsynth/config.toml
+- --config flag for explicit config path
+
 ## Evolution
 
 This document evolves at phase transitions and milestone boundaries.
 
+**After each phase transition:**
+1. Requirements invalidated? -> Move to Out of Scope with reason
+2. Requirements validated? -> Move to Validated with phase reference
+3. New requirements emerged? -> Add to Active
+4. Decisions to log? -> Add to Key Decisions
+5. "What This Is" still accurate? -> Update if drifted
+
+**After each milestone:**
+1. Full review of all sections
+2. Core Value check — still the right priority?
+3. Audit Out of Scope — reasons still valid?
+4. Update Context with current state
+
 ---
-*Last updated: 2026-03-26 after v1.0 milestone*
+*Last updated: 2026-03-26 after v1.1 milestone start*