docs(11-02): complete parallel-aware planning step

Tasks completed: 2/2
- Add parallelization_aware step to plan-phase.md
- Update write_phase_prompt with frontmatter guidance

SUMMARY: .planning/phases/11-parallel-aware-planning/11-02-SUMMARY.md

.planning/ROADMAP.md

@@ -177,7 +177,7 @@ Parallelization features (adapted from PR #43):
 
 Plans:
 - [x] 11-01: Update phase-prompt template - Add parallelization frontmatter fields (parallelizable, depends_on, files_exclusive)
-- [ ] 11-02: Add parallel-aware step to plan-phase workflow - Read config, restructure for vertical slices, document independence
+- [x] 11-02: Add parallel-aware step to plan-phase workflow - Read config, restructure for vertical slices, document independence
 - [ ] 11-03: Update execute-phase to use plan frontmatter - Use explicit markers instead of inference, backward compat
 - [ ] 11-04: Documentation and examples - Update references, add parallel vs sequential planning examples
 
@@ -207,4 +207,4 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6
 | 8. Improve Roadmap System | 1/1 | Complete | 2026-01-05 |
 | 9. Integrate Verify-Work | 1/1 | Complete | 2026-01-08 |
 | 10. Parallel Phase Execution | 4/4 | Complete | 2026-01-12 |
-| 11. Parallel-Aware Planning | 1/4 | In Progress | - |
+| 11. Parallel-Aware Planning | 2/4 | In Progress | - |

.planning/STATE.md

@@ -20,18 +20,18 @@
 ## Current Position
 
 Phase: 11 of 11 (Parallel-Aware Planning)
-Plan: 1 of 4 in current phase
+Plan: 2 of 4 in current phase
 Status: In progress
-Last activity: 2026-01-12 - Completed 11-01-PLAN.md
+Last activity: 2026-01-12 - Completed 11-02-PLAN.md
 
-Progress: ████████████░ 87% (20 of 23 plans)
+Progress: █████████████░ 91% (21 of 23 plans)
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 20
-- Average duration: 3.9 min
-- Total execution time: 77 min
+- Total plans completed: 21
+- Average duration: 3.8 min
+- Total execution time: 79 min
 
 **By Phase:**
 
@@ -47,11 +47,11 @@ Progress: ████████████░ 87% (20 of 23 plans)
 | 8 | 1 | 1 min | 1 min |
 | 9 | 1 | 3 min | 3 min |
 | 10 | 4 | 33 min | 8.3 min |
-| 11 | 1 | 4 min | 4 min |
+| 11 | 2 | 6 min | 3 min |
 
 **Recent Trend:**
-- Last 5 plans: 10-02 (15m), 10-03 (4m), 10-04 (3m), 11-01 (4m)
-- Trend: Template/workflow updates fast (11-01: 4m)
+- Last 5 plans: 10-03 (4m), 10-04 (3m), 11-01 (4m), 11-02 (2m)
+- Trend: Workflow updates fast (11-02: 2m)
 
 *Updated after each plan completion*
 
@@ -73,6 +73,8 @@ Progress: ████████████░ 87% (20 of 23 plans)
 | 10 | execute-plan = single, execute-phase = parallel | Clear naming for single-plan vs multi-plan execution |
 | 10 | Agent-history v1.2 schema | Extended for parallel tracking, dependencies, resume support |
 | 11 | Frontmatter parallelization markers | parallelizable, depends_on, files_exclusive in plan template |
+| 11 | Vertical slices over workflow stages | Maximize independence when parallelization enabled |
+| 11 | SUMMARY references only when needed | Avoid reflexive sequential chains |
 
 ### Deferred Issues
 
@@ -103,5 +105,5 @@ Drift notes: None
 ## Session Continuity
 
 Last session: 2026-01-12
-Stopped at: Completed 11-01-PLAN.md
+Stopped at: Completed 11-02-PLAN.md
 Resume file: None

.planning/phases/11-parallel-aware-planning/11-02-SUMMARY.md

@@ -0,0 +1,95 @@
+---
+phase: 11-parallel-aware-planning
+plan: 02
+subsystem: planning
+tags: [parallelization, plan-phase, frontmatter, vertical-slices]
+
+# Dependency graph
+requires:
+  - phase: 11-01
+    provides: parallelization frontmatter fields in phase-prompt template
+provides:
+  - parallelization_aware step in plan-phase.md
+  - parallelization frontmatter guidance in write_phase_prompt
+  - parallel-aware context section population rules
+affects: [execute-phase, planning]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: [vertical-slice-planning, file-ownership-analysis]
+
+key-files:
+  created: []
+  modified:
+    - get-shit-done/workflows/plan-phase.md
+
+key-decisions:
+  - "Vertical slices preferred over workflow stages when parallelization enabled"
+  - "SUMMARY references only when genuinely needed (not reflexive)"
+  - "parallelizable: false if disabled in config"
+
+patterns-established:
+  - "File ownership analysis before task grouping"
+  - "Dependency detection via SUMMARY references"
+
+issues-created: []
+
+# Metrics
+duration: 2min
+completed: 2026-01-12
+---
+
+# Phase 11 Plan 02: Parallel-Aware Planning Step Summary
+
+**Added parallelization_aware step to plan-phase.md with file ownership analysis and vertical slice restructuring logic**
+
+## Performance
+
+- **Duration:** 2 min
+- **Started:** 2026-01-12T20:12:58Z
+- **Completed:** 2026-01-12T20:14:41Z
+- **Tasks:** 2
+- **Files modified:** 1
+
+## Accomplishments
+
+- Added parallelization_aware step with file ownership analysis and vertical slice logic
+- Updated write_phase_prompt with parallelization frontmatter guidance
+- Added parallel-aware context section population rules
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Add parallelization_aware step** - `082c689` (feat)
+2. **Task 2: Update write_phase_prompt step** - `31a77ae` (feat)
+
+**Plan metadata:** (this commit)
+
+## Files Created/Modified
+
+- `get-shit-done/workflows/plan-phase.md` - Added parallelization_aware step and frontmatter guidance
+
+## Decisions Made
+
+- Vertical slice restructuring is conditional (only when beneficial)
+- File ownership analysis flags forced dependencies
+- SUMMARY references avoided when not genuinely needed
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None
+
+## Next Phase Readiness
+
+- plan-phase.md now creates parallelization frontmatter
+- Ready for 11-03 to consume frontmatter in execute-phase
+
+---
+*Phase: 11-parallel-aware-planning*
+*Completed: 2026-01-12*