docs(11-03): complete execute-phase frontmatter support plan

Tasks completed: 2/2
- Update analyze_plan_dependencies to read frontmatter fields
- Update categorization to use frontmatter parallelizable field

SUMMARY: .planning/phases/11-parallel-aware-planning/11-03-SUMMARY.md

.planning/ROADMAP.md

@@ -178,7 +178,7 @@ Parallelization features (adapted from PR #43):
 Plans:
 - [x] 11-01: Update phase-prompt template - Add parallelization frontmatter fields (parallelizable, depends_on, files_exclusive)
 - [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
+- [x] 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
 
 **Details:**
@@ -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 | 2/4 | In Progress | - |
+| 11. Parallel-Aware Planning | 3/4 | In Progress | - |

.planning/STATE.md

@@ -20,18 +20,18 @@
 ## Current Position
 
 Phase: 11 of 11 (Parallel-Aware Planning)
-Plan: 2 of 4 in current phase
+Plan: 3 of 4 in current phase
 Status: In progress
-Last activity: 2026-01-12 - Completed 11-02-PLAN.md
+Last activity: 2026-01-12 - Completed 11-03-PLAN.md
 
-Progress: █████████████░ 91% (21 of 23 plans)
+Progress: █████████████░ 96% (22 of 23 plans)
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 21
-- Average duration: 3.8 min
-- Total execution time: 79 min
+- Total plans completed: 22
+- Average duration: 3.7 min
+- Total execution time: 82 min
 
 **By Phase:**
 
@@ -47,11 +47,11 @@ Progress: █████████████░ 91% (21 of 23 plans)
 | 8 | 1 | 1 min | 1 min |
 | 9 | 1 | 3 min | 3 min |
 | 10 | 4 | 33 min | 8.3 min |
-| 11 | 2 | 6 min | 3 min |
+| 11 | 3 | 9 min | 3 min |
 
 **Recent Trend:**
-- Last 5 plans: 10-03 (4m), 10-04 (3m), 11-01 (4m), 11-02 (2m)
-- Trend: Workflow updates fast (11-02: 2m)
+- Last 5 plans: 10-04 (3m), 11-01 (4m), 11-02 (2m), 11-03 (3m)
+- Trend: Workflow updates fast (avg 3m)
 
 *Updated after each plan completion*
 
@@ -105,5 +105,5 @@ Drift notes: None
 ## Session Continuity
 
 Last session: 2026-01-12
-Stopped at: Completed 11-02-PLAN.md
+Stopped at: Completed 11-03-PLAN.md
 Resume file: None

.planning/phases/11-parallel-aware-planning/11-03-SUMMARY.md

@@ -0,0 +1,97 @@
+---
+phase: 11-parallel-aware-planning
+plan: 03
+subsystem: workflow
+tags: [execute-phase, frontmatter, parallelization, backward-compatibility]
+
+# Dependency graph
+requires:
+  - phase: 11-02
+    provides: parallelization frontmatter fields in plan template
+provides:
+  - execute-phase.md reads parallelizable, depends_on, files_exclusive from plan frontmatter
+  - frontmatter-aware categorization and wave calculation
+  - backward compatibility with old plans (inference fallback)
+affects: [11-04, execute-phase users]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - "frontmatter-first with inference fallback"
+    - "explicit over implicit dependencies"
+
+key-files:
+  created: []
+  modified:
+    - get-shit-done/workflows/execute-phase.md
+
+key-decisions:
+  - "Use frontmatter when present, fall back to inference for backward compat"
+  - "parallelizable: false without depends_on forces Wave 2+"
+  - "Add [frontmatter] annotation in wave output for visibility"
+
+patterns-established:
+  - "PLAN_HAS_FRONTMATTER tracking for conditional logic"
+  - "Frontmatter values populate same arrays as inference (unified downstream)"
+
+issues-created: []
+
+# Metrics
+duration: 3min
+completed: 2026-01-12
+---
+
+# Phase 11 Plan 03: Execute-Phase Frontmatter Support Summary
+
+**execute-phase.md reads parallelization frontmatter (parallelizable, depends_on, files_exclusive) with backward compatibility**
+
+## Performance
+
+- **Duration:** 3 min
+- **Started:** 2026-01-12T20:15:00Z
+- **Completed:** 2026-01-12T20:18:42Z
+- **Tasks:** 2
+- **Files modified:** 1
+
+## Accomplishments
+
+- analyze_plan_dependencies now reads `parallelizable`, `depends_on`, `files_exclusive` from plan frontmatter
+- Categorization and wave calculation use explicit frontmatter when present
+- Old plans without new frontmatter fields continue working via inference fallback
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Update analyze_plan_dependencies to read frontmatter fields** - `9fcc2a4` (feat)
+2. **Task 2: Update categorization to use frontmatter parallelizable field** - `5c8e5df` (feat)
+
+**Plan metadata:** (this commit) (docs: complete plan)
+
+## Files Created/Modified
+
+- `get-shit-done/workflows/execute-phase.md` - Added frontmatter reading, updated categorization, updated wave calculation
+
+## Decisions Made
+
+- Use frontmatter directly when present (no inference needed)
+- Fall back to inference for backward compatibility with old plans
+- `parallelizable: false` without explicit `depends_on` forces Wave 2+ (waits for all Wave 1 plans)
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None
+
+## Next Phase Readiness
+
+- execute-phase.md now supports both old (inference-based) and new (frontmatter-based) plans
+- Ready for 11-04 (documentation and examples)
+
+---
+*Phase: 11-parallel-aware-planning*
+*Completed: 2026-01-12*