[codex] sync upstream and preserve comment reply features

[albertcyhe]

Summary

• Add Browserbase session routing support for browser-backed adapter commands.
• Restore and extend comment ID reading plus reply workflows across Bilibili, Douyin, Instagram, Reddit, TikTok, Twitter/X, Xiaohongshu, and YouTube.
• Add shared reply helpers, platform-specific DOM/API fallbacks, manifest entries, and docs updates on top of the latest upstream main.

Notes

• Rebased onto upstream main at 40b2f750 (v1.7.19).
• results/ is intentionally not included.
• TikTok live reply testing now reports an explicit captcha-required blocker when the page shows slider verification instead of misreporting an empty comment DOM.

Validation

• npm run build
• npm run typecheck
• npm test
• npm run check:silent-column-drop
• npm run check:typed-error-lint
• git diff --check

Live smoke testing covered comment reads and reply posting on Bilibili, Douyin, Instagram, Reddit, Twitter/X, Xiaohongshu, and YouTube. TikTok comment reads succeeded; TikTok reply reached the page-level captcha gate and now fails with a clear CAPTCHA_REQUIRED message.