fix: Symlink .auto-build-data/ and .claude/rules/ in worktrees

Worktrees now have symlinks to the main repo's:
- .auto-build-data/ - specs, plans, status, memory
- .claude/rules/ - auto-build patterns and learned memory

This ensures /ab:build can detect PLANNING_COMPLETE status when
running in worktree and continue with implementation.

Also clarified in build.md that PLANNING_COMPLETE skips planning.

Bumps version to 1.0.5.

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

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

CHANGELOG.md

@@ -2,6 +2,16 @@
 
 All notable changes to Auto-Build plugin.
 
+## [1.0.5] - 2024-12-22
+
+### Fixed
+- Worktree now creates symlinks to `.auto-build-data/` and `.claude/rules/` from main repo
+- This ensures specs, plans, status, and memory are shared across worktrees
+- `/ab:build` in worktree will correctly detect `PLANNING_COMPLETE` status and continue
+
+### Improved
+- Clarified in build.md that `PLANNING_COMPLETE` skips planning phase
+
 ## [1.0.4] - 2024-12-22
 
 ### Improved