feat(dispatcher): Phase 2.2 — Task Dispatcher avec fsnotify
- internal/dispatcher: fsnotify sur inbox/, fallback poll 60s, launchAgent
- parseFrontmatter YAML, modelForPriority (critical→opus, reste→sonnet)
- waitForPrompt polling ❯, buildTaskMessage, 1 tache par session
- isSessionFree: check tmux liveness + state idle + cooldown 5min
- 5 tests unitaires (parse, model, dispatch, no-session, missing-tmux)
- go.mod: ajout fsnotify v1.9.0
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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