docs(09-02): complete StepIndicator MD3 rebuild plan

- Create 09-02-SUMMARY.md with execution details and decisions
- Update STATE.md position, decisions, session info
- Update ROADMAP.md phase 9 progress (1/3 plans complete)
- Mark COMP-04 complete in REQUIREMENTS.md

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.2
 milestone_name: UI Polish & Clarity
 status: in-progress
-stopped_at: Completed 08-02 — Phase 8 (Theme Foundation) fully complete
-last_updated: "2026-04-01T03:27:12.053Z"
+stopped_at: Completed 09-02 — StepIndicator MD3 rebuild complete
+last_updated: "2026-04-01T07:20:16.150Z"
 last_activity: 2026-04-01 — Phase 8 complete (THEME-01, THEME-02 satisfied)
 progress:
   total_phases: 4
   completed_phases: 1
-  total_plans: 2
-  completed_plans: 2
+  total_plans: 5
+  completed_plans: 3
 ---
 
 ---
@@ -62,6 +62,8 @@ Recent decisions affecting current work:
 - [Phase 08-02]: Mechanical migration only — zero DOM structure changes, only className strings replaced
 - [Phase 08-02]: Post-migration grep check is mandatory — replace_all can miss occurrences in dual-branch components with identical className strings
 - [Phase 08-02]: User visually confirmed light/dark theme renders correctly across all 4 wizard steps — THEME-01 and THEME-02 complete
+- [Phase 09-02]: Label text inside button element (not adjacent) preserves test selector compatibility: textContent includes step name
+- [Phase 09-02]: Pre-existing TextFieldMD3.test.tsx failure scoped out — component not yet built, belongs to future plan
 
 ### Pending Todos
 
@@ -73,6 +75,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-04-01T05:15:00Z
-Stopped at: Completed 08-02 — Phase 8 (Theme Foundation) fully complete
+Last session: 2026-04-01T07:20:16.148Z
+Stopped at: Completed 09-02 — StepIndicator MD3 rebuild complete
 Resume file: None