feat(collab): add miyabi collab subcommand for Collaborator canvas control
Add `miyabi collab` subcommand (Phase 3 of Miyabi canvas integration):
miyabi collab list [--json] [--type TYPE] [--count]
miyabi collab add <type> [--file PATH] [--pos x,y] [--size w,h] [--idempotent]
miyabi collab rm <tile_id>
miyabi collab move <tile_id> --pos x,y
miyabi collab resize <tile_id> --size w,h
miyabi collab viewport [--pan x,y] [--zoom 1.0]
miyabi collab status
Delegates to ~/.local/bin/collab (collab CLI v0.2.0+).
Error handling includes installation hint on binary not found.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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