docs(05): create phase plan

.planning/ROADMAP.md

@@ -37,7 +37,11 @@ Full details: `.planning/milestones/v1.0-ROADMAP.md`
   1. User can set a traffic class to square, sawtooth, or triangle waveform and hear a tonally distinct sound with no audible aliasing or buzzing artifacts
   2. Sine waveform continues to produce the same output as v1.0 — no regression
   3. The synthesis bank builds layers from a passed-in config map rather than a hardcoded class list
-**Plans**: TBD
+**Plans:** 2 plans
+
+Plans:
+- [ ] 05-01-PLAN.md — Waveform types: WaveformType enum, WaveformPresetHarmonics, NewLayer resolution
+- [ ] 05-02-PLAN.md — Bank decoupling: NewBank injected config map, dynamic GainPerLayer, test updates
 
 ### Phase 6: Config Package and Sound Overrides
 **Goal**: Users can create a TOML config file to override frequency and waveform per traffic class, with auto-discovery, partial override semantics, and clear validation errors
@@ -70,6 +74,6 @@ Full details: `.planning/milestones/v1.0-ROADMAP.md`
 | 2. Audio Synthesis Engine | v1.0 | 3/3 | Complete | 2026-03-26 |
 | 3. Pipeline Integration and MVP | v1.0 | 2/2 | Complete | 2026-03-26 |
 | 4. Power User Features | v1.0 | 2/2 | Complete | 2026-03-26 |
-| 5. Waveform Types and Bank Decoupling | v1.1 | 0/? | Not started | - |
+| 5. Waveform Types and Bank Decoupling | v1.1 | 0/2 | Not started | - |
 | 6. Config Package and Sound Overrides | v1.1 | 0/? | Not started | - |
 | 7. Custom Rules and Print-Config | v1.1 | 0/? | Not started | - |