* feat(channels): add V2EX support via public API
V2EX provides a public JSON API that requires no authentication.
This PR adds:
- agent_reach/channels/v2ex.py: V2EXChannel (tier=0, zero-config)
- can_handle() matches v2ex.com URLs
- check() verifies API reachability via urllib (no extra deps)
- Register V2EXChannel in channels/__init__.py
- SKILL.md: add V2EX section with curl examples for hot topics,
node browsing, topic detail, replies, and user info
- tests/test_channels.py: URL matching + mocked ok/warn check tests
V2EX API endpoints used:
GET /api/v2/topics/hot — hot topics
GET /api/topics/show.json — node topics / topic detail
GET /api/replies/show.json — topic replies
GET /api/members/show.json — user info
* feat(channels): expand V2EX channel with data-fetching methods
Add get_hot_topics, get_node_topics, get_topic, get_user, and search
methods to V2EXChannel using stdlib urllib only (no new dependencies).
Update unit tests and SKILL.md with Python call examples.
* feat(v2ex): add data fetching methods to V2EXChannel
- YouTube: warn when only Node.js is installed but yt-dlp config file
is missing (previously returned "ok" incorrectly)
- Douyin: use `mcporter list` instead of calling with a hardcoded
invalid share URL that always fails
- cli: replace bare `except:` with `except Exception:` in
`_detect_environment` to avoid catching KeyboardInterrupt/SystemExit
- cli: fix unclosed file handle for cloud VM detection
- config: use `os.open()` with 0o600 mode to eliminate permission
race window when saving credentials
Before: everything under tier 0 showed ✅ with vague descriptions
After: each channel shows its actual capability and limitations
Changes:
- GitHub: 'Public repos only. Set github_token for private repos'
- Twitter: shows 'Full access' vs 'Read-only' depending on birdx
- Bilibili: ⚠️ warning on servers about potential IP blocks
- XiaoHongShu: friendly message when no cookie (was showing Jina 451)
- Doctor format: tier 0 items now show detailed status messages, not just ✅
- README: platform table updated to match reality (removed exaggerated claims)
- README: doctor example updated to show new honest format
