v0.1.0-rc9.1 Added task filtering and deep linking

✨ Features
- [filter]: add FilterTasks and IsOldCompleted functions to
  consolidate task list filtering logic
- [deeplink]: add ParseReference with improved error messages and
  deprecate ParseDeepLink

🧪 Tests
- [integration]: add workflow metadata tests covering Eisenhower,
  kanban status, and field preservation
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