fix: Complete rewrite of progress tracking system (v1.0.9)

The /ab:build command was executing tasks but not tracking progress.
This rewrite enforces dual progress tracking in BOTH status.json AND plan.md.

Key changes:

build.md - Complete restructure:
- Step-by-step execution workflow (like migrate.md)
- Step 4d MANDATORY: Update both status.json and plan.md
- User confirmation required between tasks
- Visual Progress Tracker table in plan template

planner.md - New plan template:
- Progress Tracker table at top with ⬜/✅ indicators
- Each task has `- **Status**: ⬜ Pending` field
- Status header shows overall progress

coder.md - Dual file updates:
- 5a: Update status.json (currentTask, tasksCompleted, history)
- 5b: Update plan.md Progress Tracker (⬜ Pending → ✅ Done)

Benefits:
- Visual progress in plan.md (human readable)
- JSON progress in status.json (programmatic)
- Redundancy ensures progress is never lost
- Team can see exactly which tasks are complete

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -2,6 +2,44 @@
 
 All notable changes to Auto-Build plugin.
 
+## [1.0.9] - 2024-12-22
+
+### Fixed
+- **Complete rewrite of progress tracking system** - now enforced at every step
+- Progress is tracked in BOTH status.json AND plan.md (dual tracking)
+- Plan now includes visual Progress Tracker table with ⬜/✅ status indicators
+
+### Changed
+- **build.md**: Complete restructure with step-by-step execution workflow
+  - Step 4d now MANDATORY updates both status.json and plan.md
+  - Added Progress Tracker table format in plan template
+  - User confirmation required between tasks
+- **planner.md**: New plan.md template with Progress Tracker table
+  - Each task now has `- **Status**: ⬜ Pending` field
+  - Table at top shows all tasks with status columns
+- **coder.md**: Step 5 now requires updating both files
+  - 5a: Update status.json with currentTask, tasksCompleted
+  - 5b: Update plan.md Progress Tracker (⬜→✅)
+
+### Why This Matters
+- Visual progress tracking in plan.md (can see at a glance)
+- JSON progress in status.json (for programmatic access)
+- Both files updated = redundancy and visibility
+- Team members can see exactly which tasks are done
+
+## [1.0.8] - 2024-12-22
+
+### Fixed
+- **`/ab:build` now properly tracks task progress in status.json**
+- Added explicit "MANDATORY" progress tracking instructions in build.md
+- Added status.json update step to coder agent
+- Progress is now visible for team collaboration (currentTask, history entries)
+
+### Changed
+- build.md: Added "CRITICAL: Progress Tracking Requirements" section
+- build.md: Detailed "Step 4c: MANDATORY - Update Progress After Task Completion"
+- coder.md: New "Step 5: Update Progress (MANDATORY)" before reporting changes
+
 ## [1.0.7] - 2024-12-22
 
 ### Fixed