docs(01-01): complete solution scaffold plan

- SUMMARY.md with execution results and metrics
- STATE.md advanced to plan 2 of 2 (50%)
- ROADMAP.md updated with plan progress
- CODE-02 requirement marked complete

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.planning/STATE.md

@@ -2,15 +2,15 @@
 gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
-status: planning
-stopped_at: Phase 1 context gathered
-last_updated: "2026-03-27T01:30:49.088Z"
-last_activity: 2026-03-27 — Roadmap created; all 14 v1 requirements mapped to 5 phases
+status: executing
+stopped_at: Completed 01-01-PLAN.md
+last_updated: "2026-03-27T22:53:36.052Z"
+last_activity: 2026-03-27
 progress:
   total_phases: 5
   completed_phases: 0
-  total_plans: 0
-  completed_plans: 0
+  total_plans: 2
+  completed_plans: 1
   percent: 0
 ---
 
@@ -21,14 +21,14 @@ progress:
 See: .planning/PROJECT.md (updated 2026-03-27)
 
 **Core value:** A working, well-understood AI chat interface — every line of code is intentional and explained
-**Current focus:** Phase 1 — Architecture Foundation
+**Current focus:** Phase 01 — architecture-foundation
 
 ## Current Position
 
-Phase: 1 of 5 (Architecture Foundation)
-Plan: 0 of TBD in current phase
-Status: Ready to plan
-Last activity: 2026-03-27 — Roadmap created; all 14 v1 requirements mapped to 5 phases
+Phase: 01 (architecture-foundation) — EXECUTING
+Plan: 2 of 2
+Status: Ready to execute
+Last activity: 2026-03-27
 
 Progress: [░░░░░░░░░░] 0%
 
@@ -52,6 +52,7 @@ Progress: [░░░░░░░░░░] 0%
 - Trend: —
 
 *Updated after each plan completion*
+| Phase 01 P01 | 2min | 2 tasks | 26 files |
 
 ## Accumulated Context
 
@@ -63,6 +64,7 @@ Recent decisions affecting current work:
 - [Init]: Streaming (STRM-01/02/03) deferred to v2 — user chose non-streaming for v1
 - [Init]: Tutorial convention established in Phase 1 — CODE-01/02 anchor there, applied cross-phase
 - [Init]: Phase order follows strict dependency chain: scaffold → storage → AI → display → UI polish
+- [Phase 01]: Pinned .NET 9 via global.json since machine default is .NET 10
 
 ### Pending Todos
 
@@ -75,6 +77,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-03-27T01:30:49.085Z
-Stopped at: Phase 1 context gathered
-Resume file: .planning/phases/01-architecture-foundation/01-CONTEXT.md
+Last session: 2026-03-27T22:53:36.049Z
+Stopped at: Completed 01-01-PLAN.md
+Resume file: None