Add document lifecycle handlers for spike, ADR, decision, and worktree
operations. This brings the tool count from 9 to 16.
New tools:
- blue_spike_create: Start time-boxed investigation
- blue_spike_complete: Complete investigation with outcome
- blue_adr_create: Create Architecture Decision Record
- blue_decision_create: Create lightweight Decision Note
- blue_worktree_create: Create isolated git worktree for RFC
- blue_worktree_list: List active worktrees
- blue_worktree_remove: Remove worktree after merge
All handlers use Blue's voice for consistent messaging.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
