fix: pr merge requires 'do' param, update skills docs with test findings
Code fixes:
- pr +merge: add 'do' parameter (merge/rebase/squash) and --method flag
to fix "请选择合并方式" error
Skills documentation updates:
- gitlink-pr: add complete PR workflow with create_file/update_file,
document merge methods, PR status values, state filter behavior
- gitlink-shared: update API notes table (release delete now works,
create_file needs base64, update_file needs SHA), add file operations
API section with create/update/delete examples
- gitlink-release: update delete docs (now works with version_id)
All 8 scenarios tested and passing (2026-04-04):
auth/user ✅, repo ✅, branch ✅(delete=API bug),
issue ✅, PR ✅, release ✅, search/org ✅, CI ✅(no config)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>