Add `bird bookmarks` command to fetch the authenticated user's bookmarked tweets.
- New `getBookmarks()` method in TwitterClient
- Uses graphql_timeline_v2_bookmark_timeline feature flag
- Supports `--count` and `--json` options
- Follows existing patterns for query ID rotation and retry logic
Usage:
bird bookmarks # Get your recent bookmarks
bird bookmarks -n 50 # Get 50 bookmarks
bird bookmarks --json # Output as JSON
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Co-Authored-By: Claude Opus 4.5 <[email protected]>