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/REQUIREMENTS.md

@@ -32,7 +32,7 @@
 ### Code Quality
 
 - [ ] **CODE-01**: Every Blazor concept introduced has inline comments explaining what and why
-- [ ] **CODE-02**: Each phase introduces one concept incrementally (tutorial-style progression)
+- [x] **CODE-02**: Each phase introduces one concept incrementally (tutorial-style progression)
 
 ## v2 Requirements
 
@@ -90,7 +90,7 @@ Which phases cover which requirements. Updated during roadmap creation.
 | UI-02 | Phase 5 | Pending |
 | UI-03 | Phase 5 | Pending |
 | CODE-01 | Phase 1 | Pending |
-| CODE-02 | Phase 1 | Pending |
+| CODE-02 | Phase 1 | Complete |
 
 **Coverage:**
 - v1 requirements: 14 total

.planning/ROADMAP.md

@@ -32,7 +32,7 @@ Decimal phases appear between their surrounding integers in numeric order.
   5. Every file introduced contains inline comments explaining the Blazor concept it demonstrates
 **Plans**: 2 plans
 Plans:
-- [ ] 01-01-PLAN.md — Solution scaffold: create three projects, wire references, configure ports
+- [x] 01-01-PLAN.md — Solution scaffold: create three projects, wire references, configure ports
 - [ ] 01-02-PLAN.md — Health check round-trip: shared DTO, API controller with CORS, typed client, home page
 **UI hint**: yes
 

.planning/STATE.md

@@ -2,15 +2,15 @@
 gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
-status: planning
+status: executing
-stopped_at: Phase 1 context gathered
+stopped_at: Completed 01-01-PLAN.md
-last_updated: "2026-03-27T01:30:49.088Z"
+last_updated: "2026-03-27T22:53:36.052Z"
-last_activity: 2026-03-27 — Roadmap created; all 14 v1 requirements mapped to 5 phases
+last_activity: 2026-03-27
 progress:
   total_phases: 5
   completed_phases: 0
-  total_plans: 0
+  total_plans: 2
-  completed_plans: 0
+  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)
+Phase: 01 (architecture-foundation) — EXECUTING
-Plan: 0 of TBD in current phase
+Plan: 2 of 2
-Status: Ready to plan
+Status: Ready to execute
-Last activity: 2026-03-27 — Roadmap created; all 14 v1 requirements mapped to 5 phases
+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
+Last session: 2026-03-27T22:53:36.049Z
-Stopped at: Phase 1 context gathered
+Stopped at: Completed 01-01-PLAN.md
-Resume file: .planning/phases/01-architecture-foundation/01-CONTEXT.md
+Resume file: None

.planning/phases/01-architecture-foundation/01-01-SUMMARY.md

@@ -0,0 +1,121 @@
+---
+phase: 01-architecture-foundation
+plan: 01
+subsystem: infra
+tags: [dotnet, blazor-wasm, webapi, solution-scaffold, net9]
+
+# Dependency graph
+requires: []
+provides:
+  - Three-project .NET 9 solution (Client, Api, Shared)
+  - Predictable dev ports (Client: 5200, API: 7100)
+  - Shared project reference wiring
+  - API base URL configuration in client
+affects: [01-02, 02, 03, 04, 05]
+
+# Tech tracking
+tech-stack:
+  added: [".NET 9 SDK 9.0.312", "Blazor WebAssembly Standalone", "ASP.NET Core Web API", "Class Library"]
+  patterns: ["Three-project solution with shared library", "Predictable port assignment", "global.json SDK pinning"]
+
+key-files:
+  created:
+    - ChatAgent.sln
+    - global.json
+    - src/ChatAgent.Client/ChatAgent.Client.csproj
+    - src/ChatAgent.Api/ChatAgent.Api.csproj
+    - src/ChatAgent.Shared/ChatAgent.Shared.csproj
+    - src/ChatAgent.Client/wwwroot/appsettings.json
+  modified:
+    - .gitignore
+    - src/ChatAgent.Client/Properties/launchSettings.json
+    - src/ChatAgent.Api/Properties/launchSettings.json
+
+key-decisions:
+  - "Pinned .NET 9 via global.json since .NET 10 is installed as default"
+  - "Kept inspectUri in Client launchSettings for Blazor WASM debugging support"
+
+patterns-established:
+  - "SDK pinning: global.json at repo root locks .NET version"
+  - "Port convention: Client HTTPS=5200, API HTTPS=7100"
+  - "Client config: wwwroot/appsettings.json for public settings (ApiBaseUrl)"
+
+requirements-completed: [CODE-02]
+
+# Metrics
+duration: 2min
+completed: 2026-03-27
+---
+
+# Phase 01 Plan 01: Solution Scaffold Summary
+
+**Three-project .NET 9 solution with Blazor WASM client, ASP.NET Core Web API, and shared class library at predictable dev ports**
+
+## Performance
+
+- **Duration:** 2 min
+- **Started:** 2026-03-27T22:50:21Z
+- **Completed:** 2026-03-27T22:52:42Z
+- **Tasks:** 2
+- **Files modified:** 26
+
+## Accomplishments
+- Created ChatAgent.sln with three projects targeting net9.0
+- Wired ChatAgent.Shared as ProjectReference in both Client and Api
+- Configured predictable ports (Client: 5200, API: 7100) and API base URL
+- Removed template boilerplate (WeatherForecast, Class1)
+- Pinned .NET 9 SDK via global.json
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Create solution and three projects with references** - `eeaa9de` (feat)
+2. **Task 2: Configure predictable dev ports and clean up template defaults** - `c6f1225` (feat)
+
+## Files Created/Modified
+- `ChatAgent.sln` - Solution file at repo root with 3 projects
+- `global.json` - Pins .NET SDK to 9.0.312
+- `src/ChatAgent.Client/ChatAgent.Client.csproj` - Blazor WASM client with Shared reference
+- `src/ChatAgent.Api/ChatAgent.Api.csproj` - Web API with Shared reference
+- `src/ChatAgent.Shared/ChatAgent.Shared.csproj` - Shared class library
+- `src/ChatAgent.Client/Properties/launchSettings.json` - Client ports 5200/5100
+- `src/ChatAgent.Api/Properties/launchSettings.json` - API ports 7100/7000
+- `src/ChatAgent.Client/wwwroot/appsettings.json` - ApiBaseUrl pointing to API
+- `.gitignore` - Added .NET-specific ignore patterns
+
+## Decisions Made
+- Pinned .NET 9 via global.json since machine default is .NET 10 (10.0.201) -- required to match CLAUDE.md constraint
+- Kept inspectUri in Client launchSettings profiles for Blazor WASM debugging support
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 3 - Blocking] Added global.json to pin .NET 9 SDK**
+- **Found during:** Task 1 (before project creation)
+- **Issue:** Machine has .NET 10 as default SDK; `dotnet new` would target net10.0 without intervention
+- **Fix:** Created global.json with version 9.0.312 and rollForward: latestPatch
+- **Files modified:** global.json
+- **Verification:** `dotnet --version` returns 9.0.312
+- **Committed in:** eeaa9de (Task 1 commit)
+
+---
+
+**Total deviations:** 1 auto-fixed (1 blocking)
+**Impact on plan:** Essential for correctness -- without SDK pinning, all projects would target wrong framework version.
+
+## Issues Encountered
+None
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Solution scaffold is complete and builds with zero errors
+- Ready for Plan 02: CORS configuration, health endpoint, HttpClient setup, and tutorial comments
+- All three projects have proper references and port alignment
+
+---
+*Phase: 01-architecture-foundation*
+*Completed: 2026-03-27*