docs(10-04): complete agent-history schema update plan

Tasks completed: 3/3
- Update schema version and add new fields
- Add parallel execution examples
- Document resume support for parallel groups

Phase 10 complete. Milestone complete.

SUMMARY: .planning/phases/10-parallel-phase-execution/10-04-SUMMARY.md

.planning/phases/10-parallel-phase-execution/10-04-SUMMARY.md

@@ -0,0 +1,109 @@
+---
+phase: 10-parallel-phase-execution
+plan: 04
+subsystem: infra
+tags: [agent-tracking, parallel-execution, resume, schema]
+
+# Dependency graph
+requires:
+  - phase: 10-01
+    provides: execute-plan workflow renamed
+  - phase: 10-02
+    provides: execute-phase parallel workflow
+  - phase: 10-03
+    provides: execute-phase command and config
+provides:
+  - Agent-history v1.2 schema with parallel tracking fields
+  - Parallel group format conventions
+  - Resume documentation for parallel batches
+affects: [execute-phase, resume-task]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: [parallel-group-ids, dependency-tracking]
+
+key-files:
+  created: []
+  modified: [get-shit-done/templates/agent-history.md]
+
+key-decisions:
+  - "Version bump to 1.2 for parallel fields"
+  - "Parallel group format: phase-{phase}-batch-{timestamp}"
+
+patterns-established:
+  - "Agent entries track execution_mode for sequential vs parallel"
+  - "depends_on links agents for dependency resolution"
+
+issues-created: []
+
+# Metrics
+duration: 3min
+completed: 2026-01-12
+---
+
+# Phase 10 Plan 4: Agent History Schema v1.2 Summary
+
+**Extended agent-history.json schema to v1.2 with parallel execution tracking, dependency fields, and resume documentation**
+
+## Performance
+
+- **Duration:** 3 min
+- **Started:** 2026-01-12T19:21:58Z
+- **Completed:** 2026-01-12T19:24:30Z
+- **Tasks:** 3
+- **Files modified:** 1
+
+## Accomplishments
+
+- Updated schema version from 1.0 to 1.2
+- Added 7 new fields for parallel execution tracking
+- Added queued and failed status values
+- Created parallel execution examples (plan-level, dependency)
+- Documented parallel resume workflow and conflict detection
+
+## Task Commits
+
+1. **Task 1: Update schema version and add new fields** - `eaed882` (feat)
+2. **Task 2: Add parallel execution examples** - `cc7e078` (feat)
+3. **Task 3: Document resume support for parallel groups** - `3743d1c` (feat)
+
+**Plan metadata:** (pending)
+
+## Files Created/Modified
+
+- `get-shit-done/templates/agent-history.md` - Extended with v1.2 schema, parallel fields, examples, resume docs
+
+## Decisions Made
+
+- Version bumped to 1.2 to indicate parallel execution capability
+- Parallel group format standardized as `phase-{phase}-batch-{timestamp}`
+- Resume documentation includes conflict detection for parallel scenarios
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None
+
+## Phase 10 Complete
+
+All 4 plans executed:
+- 10-01: Renamed execute-phase → execute-plan workflow
+- 10-02: Created parallel execution workflow (execute-phase.md)
+- 10-03: Created /gsd:execute-phase command + parallelization config
+- 10-04: Extended agent-history schema to v1.2
+
+Parallel phase execution now available via `/gsd:execute-phase`.
+
+## Next Phase Readiness
+
+- Phase 10 complete
+- Milestone complete - all 10 phases finished
+- Ready for `/gsd:complete-milestone`
+
+---
+*Phase: 10-parallel-phase-execution*
+*Completed: 2026-01-12*