docs(01-01): complete backend scaffold plan — SUMMARY, STATE, ROADMAP, REQUIREMENTS updated

- Created 01-01-SUMMARY.md with full accomplishment record
- STATE.md: advanced to plan 2/3, progress 33%, added 3 key decisions
- ROADMAP.md: Phase 1 updated to 1/3 summaries (In Progress)
- REQUIREMENTS.md: marked INF-01, INF-02, DEV-01, DEV-02, SHW-01, SHW-02 complete

.planning/STATE.md

@@ -1,3 +1,19 @@
+---
+gsd_state_version: 1.0
+milestone: v1.0
+milestone_name: milestone
+status: executing
+stopped_at: Completed 01-foundation/01-01-PLAN.md
+last_updated: "2026-04-05T18:49:18.330Z"
+last_activity: 2026-04-05
+progress:
+  total_phases: 7
+  completed_phases: 0
+  total_plans: 3
+  completed_plans: 1
+  percent: 0
+---
+
 # Project State
 
 ## Project Reference
@@ -5,20 +21,21 @@
 See: .planning/PROJECT.md (updated 2026-04-05)
 
 **Core value:** Load a song, build a synchronized light show, play it back live — with precise control over every effect on every device.
-**Current focus:** Phase 1 — Foundation
+**Current focus:** Phase 01 — foundation
 
 ## Current Position
 
-Phase: 1 of 7 (Foundation)
-Plan: 0 of 3 in current phase
-Status: Ready to plan
-Last activity: 2026-04-05 — Roadmap and state initialized
+Phase: 01 (foundation) — EXECUTING
+Plan: 2 of 3
+Status: Ready to execute
+Last activity: 2026-04-05
 
 Progress: [░░░░░░░░░░] 0%
 
 ## Performance Metrics
 
 **Velocity:**
+
 - Total plans completed: 0
 - Average duration: —
 - Total execution time: 0 hours
@@ -30,10 +47,12 @@ Progress: [░░░░░░░░░░] 0%
 | - | - | - | - |
 
 **Recent Trend:**
+
 - Last 5 plans: —
 - Trend: —
 
 *Updated after each plan completion*
+| Phase 01-foundation P01 | 4 | 2 tasks | 23 files |
 
 ## Accumulated Context
 
@@ -46,6 +65,9 @@ Recent decisions affecting current work:
 - Init: python-mpv-jsonipc preferred over ctypes binding — no libmpv.dll dependency on Windows
 - Init: Firmware deferred to Phase 7 — protocol must be validated against simulator first
 - Init: undo/redo built in Phase 4 — retrofitting command pattern is expensive
+- [Phase 01-foundation]: Module-level state in main.py for registry/show_store — acceptable for Phase 1, Phase 2 migrates to Depends()
+- [Phase 01-foundation]: StaticFiles mounted last in create_app() — prevents catch-all interception of /api/* routes
+- [Phase 01-foundation]: encode_animation_cmd stubs return b'' — Phase 3 implements real UDP animation command encoding
 
 ### Pending Todos
 
@@ -59,8 +81,8 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-04-05
-Stopped at: Roadmap created, STATE.md initialized
+Last session: 2026-04-05T18:49:18.325Z
+Stopped at: Completed 01-foundation/01-01-PLAN.md
 Resume file: None
 
 Next action: `/gsd:plan-phase 1`