feat: Move specs and memory to git for multi-developer collaboration (v1.0.6)

BREAKING CHANGE: Specs, plans, and memory moved from .auto-build-data/ (gitignored)
to .auto-build/ (git-tracked) to enable team collaboration.

Changes:
- Specs/plans now in .auto-build/specs/ (shared with team)
- Memory (patterns, gotchas) now in .auto-build/memory/ (shared with team)
- .auto-build-data/ now only contains local data (worktrees, cache)
- Added /ab:migrate command for existing projects
- Removed symlinks from worktree-create.sh (no longer needed)

Benefits:
- Any developer can continue a plan started by another
- Patterns and gotchas shared across team
- Works on Windows/Linux/Mac without symlinks
- Full version history in git

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

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

plugin/commands/spec.md

@@ -17,13 +17,13 @@ Create a comprehensive specification for a new feature using the spec-writer age
 ### 1. Initialize
 
 - Parse feature name from arguments (kebab-case: "User Dashboard" -> "user-dashboard")
-- Check if `.auto-build-data/` exists in the project root
+- Check if `.auto-build/` exists in the project root
   - If not: Create the directory structure:
     ```
-    mkdir -p .auto-build-data/specs
-    mkdir -p .auto-build-data/memory
+    mkdir -p .auto-build/specs
+    mkdir -p .auto-build/memory
     ```
-- Check if spec already exists at `.auto-build-data/specs/{feature-name}/`
+- Check if spec already exists at `.auto-build/specs/{feature-name}/`
   - If exists: Ask "Update existing spec or create new version?"
 
 ### 2. Gather Requirements
@@ -56,14 +56,14 @@ Launch the **spec-writer** agent with:
 ### 4. Generate Specification
 
 The spec-writer agent creates:
-- `.auto-build-data/specs/{feature-name}/spec.md` using the template
-- `.auto-build-data/specs/{feature-name}/status.json` with state: "SPEC_COMPLETE"
+- `.auto-build/specs/{feature-name}/spec.md` using the template
+- `.auto-build/specs/{feature-name}/status.json` with state: "SPEC_COMPLETE"
 
 ### 5. Confirmation
 
 Display:
 ```
-Specification created: .auto-build-data/specs/{feature-name}/spec.md
+Specification created: .auto-build/specs/{feature-name}/spec.md
 
 Summary:
 - [Key requirement 1]
@@ -74,8 +74,9 @@ Affected files identified: X files
 Estimated complexity: [Low/Medium/High]
 
 Next steps:
-- Review the spec: Read .auto-build-data/specs/{feature-name}/spec.md
+- Review the spec: Read .auto-build/specs/{feature-name}/spec.md
 - Start implementation: /ab:build {feature-name}
+- Commit to share with team: git add .auto-build/ && git commit -m "spec: {feature-name}"
 ```
 
 ## Spec Template