* feat: add network request detail and filtering for request tracking
- Add `network request <requestId>` command to view full request/response
details including response body via CDP Network.getResponseBody
- Add --type, --method, --status filter flags to `network requests`
- --type: comma-separated resource types (xhr,fetch,document)
- --method: filter by HTTP method
- --status: supports exact (200), class (2xx), range (400-499)
- Extend TrackedRequest with request_id, post_data, status,
response_headers, mime_type fields
- Update Network.responseReceived handler to also populate
tracked_requests (previously only updated HAR entries)
- Add tests for parse commands and matches_status_filter
- Update README, SKILL.md, docs, and help text
Closes#932
* fix: show request ID and status in network requests output
