docs(01-architecture-foundation): create phase plan

.planning/ROADMAP.md

@@ -30,7 +30,10 @@ Decimal phases appear between their surrounding integers in numeric order.
   3. The shared models library is referenced by both projects with no duplication of DTOs
   4. Running `dotnet publish` on the WASM project completes with no IL trim warnings
   5. Every file introduced contains inline comments explaining the Blazor concept it demonstrates
-**Plans**: TBD
+**Plans**: 2 plans
+Plans:
+- [ ] 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
 
 ### Phase 2: Conversation Storage
@@ -84,7 +87,7 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5
 
 | Phase | Plans Complete | Status | Completed |
 |-------|----------------|--------|-----------|
-| 1. Architecture Foundation | 0/TBD | Not started | - |
+| 1. Architecture Foundation | 0/2 | Planning complete | - |
 | 2. Conversation Storage | 0/TBD | Not started | - |
 | 3. Basic AI Chat | 0/TBD | Not started | - |
 | 4. Message Display | 0/TBD | Not started | - |