docs(bird): update skill for v0.5-0.8 features

[odysseus0]

Updates the bird skill documentation to cover features added in v0.5-0.8:

Added Commands

• `home` - Home timeline (For You / Following)
• `reply` - Reply to a tweet
• `replies` - List replies (distinct from thread)
• `user-tweets` - Profile timeline
• `bookmarks` with thread expansion flags
• `unbookmark` - Remove bookmarks
• `likes` - Liked tweets
• `news` / `trending` - AI-curated Explore tabs
• `lists` / `list-timeline` - Twitter Lists
• `following` / `followers` - User relationships
• `follow` / `unfollow` - Manage follows (v0.8.0)
• `about` - Account origin/location info
• `check` - Show credential sources
• `query-ids` - Refresh GraphQL cache

Added Features

• Media uploads (`--media`, `--alt`)
• Pagination (`--all`, `--max-pages`, `--cursor`)
• Output options (`--plain`, `--json`, `--quote-depth`)
• Cookie options (`--cookie-source`, `--chrome-profile-dir`)
• Config file format documentation
• Library usage examples
• Troubleshooting section

Updated

• Posting advice (engagement actions now work via CLI)
• Removed browser-only recommendation for likes/retweets/follows

[steipete]

Landed via temp rebase onto main.

• Gate: pnpm lint && pnpm build && pnpm test
• Land commit: 5a42f7c
• Merge commit: f2c25c5

Thanks @odysseus0!