docs(01-01): complete project scaffold and config system plan

- Created comprehensive SUMMARY.md with all execution details
- Updated STATE.md: 1/4 plans in phase 1 complete, 16.7% overall progress
- Documented deviation (venv creation) and decisions
- Verified all files and commits exist (self-check passed)

.planning/STATE.md

@@ -10,30 +10,24 @@ See: .planning/PROJECT.md (updated 2026-02-11)
 ## Current Position
 
 Phase: 1 of 6 (Data Infrastructure)
-Plan: 0 of TBD in current phase
-Status: Ready to plan
-Last activity: 2026-02-11 — Roadmap created with 6 phases covering all 40 v1 requirements
+Plan: 1 of 4 in current phase
+Status: Executing
+Last activity: 2026-02-11 — Completed 01-01-PLAN.md (Project scaffold, config system, base API client)
 
-Progress: [░░░░░░░░░░] 0%
+Progress: [██░░░░░░░░] 16.7% (1/6 phases planned, 1/4 plans in phase 1 complete)
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 0
-- Average duration: - min
-- Total execution time: 0.0 hours
+- Total plans completed: 1
+- Average duration: 3 min
+- Total execution time: 0.05 hours
 
 **By Phase:**
 
 | Phase | Plans | Total | Avg/Plan |
 |-------|-------|-------|----------|
-| - | - | - | - |
-
-**Recent Trend:**
-- Last 5 plans: None yet
-- Trend: No data
-
-*Updated after each plan completion*
+| 01 - Data Infrastructure | 1/4 | 3 min | 3 min/plan |
 
 ## Accumulated Context
 
@@ -46,6 +40,8 @@ Recent decisions affecting current work:
 - Weighted rule-based scoring over ML for explainability
 - Public data only for reproducibility
 - Modular CLI scripts for flexibility during development
+- Virtual environment required for dependency isolation (01-01: PEP 668 externally-managed Python)
+- Auto-creation of directories on config load (01-01: data_dir, cache_dir field validators)
 
 ### Pending Todos
 
@@ -57,6 +53,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-02-11 - Roadmap creation
-Stopped at: Roadmap and STATE files initialized, ready to plan Phase 1
-Resume file: None
+Last session: 2026-02-11 - Plan execution
+Stopped at: Completed 01-01-PLAN.md
+Resume file: .planning/phases/01-data-infrastructure/01-01-SUMMARY.md