docs(05-01): complete unified intermediate directory plan

- Added intermediate_path config field with KB_INTERMEDIATE_PATH env var support
- Updated Pipeline to use configurable intermediate directory
- Updated CLI to default to intermediate_path instead of cwd
- Completed requirements: INT-01, INT-02, INT-03

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.planning/STATE.md

@@ -2,16 +2,16 @@
 gsd_state_version: 1.0
 milestone: v1.1
 milestone_name: Architecture Refactor
-status: planning
-stopped_at: Phase 5 context gathered
-last_updated: "2026-03-16T14:54:52.761Z"
-last_activity: 2026-03-16 — v1.1 roadmap created
+status: executing
+stopped_at: 05-01 unified intermediate directory completed
+last_updated: "2026-03-16T15:14:10Z"
+last_activity: 2026-03-16 — 05-01 unified intermediate directory completed
 progress:
   total_phases: 6
   completed_phases: 4
   total_plans: 12
-  completed_plans: 12
-  percent: 0
+  completed_plans: 13
+  percent: 8
 ---
 
 # Project State
@@ -26,28 +26,28 @@ See: .planning/PROJECT.md (updated 2026-03-16)
 ## Current Position
 
 Phase: 5 of 6 (归档与目录优化)
-Plan: 0 of 3 in current phase
-Status: Ready to plan
-Last activity: 2026-03-16 — v1.1 roadmap created
+Plan: 1 of 3 in current phase
+Status: Executing
+Last activity: 2026-03-16 — 05-01 unified intermediate directory completed
 
-Progress: [░░░░░░░░░░] 0% (v1.1 milestone)
+Progress: [█░░░░░░░░░] 8% (v1.1 milestone)
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 0 (v1.1)
-- Average duration: -
-- Total execution time: -
+- Total plans completed: 1 (v1.1)
+- Average duration: 2 min
+- Total execution time: 2 min
 
 **By Phase:**
 
 | Phase | Plans | Total | Avg/Plan |
 |-------|-------|-------|----------|
-| 5. 归档与目录优化 | 0/3 | - | - |
+| 5. 归档与目录优化 | 1/3 | 2 min | 2 min |
 | 6. 代码整合 | 0/2 | - | - |
 
 **Recent Trend:**
-- Last 5 plans: N/A
+- Last 5 plans: 2 min
 - Trend: N/A
 
 *Updated after each plan completion*
@@ -74,8 +74,8 @@ None.
 
 ## Session Continuity
 
-Last session: 2026-03-16T14:54:52.760Z
-Stopped at: Phase 5 context gathered
-Resume file: .planning/phases/05-archive-directory/05-CONTEXT.md
+Last session: 2026-03-16T15:14:10Z
+Stopped at: 05-01 unified intermediate directory completed
+Resume file: .planning/phases/05-archive-directory/05-01-SUMMARY.md
 
-**Next step:** `/gsd:plan-phase 5`
+**Next step:** Execute 05-02-PLAN.md