#19579: fix(skills): complete clawhub SKILL.md with missing commands

## Summary - Add missing CLI commands: `sync`, `delete`/`undelete`, `logout` - Add `--force` flag to `install` and `--limit` to `search` - Fix registry URL from `clawhub.com` to `clawhub.ai` (matches CONTRIBUTING.md and docs/tools/clawhub.md) - Add lockfile mention (`.clawhub/lock.json`) and `--no-input` note - Use `##` headings for consistent structure The bundled SKILL.md was missing several commands documented in `docs/tools/clawhub.md`, most notably `clawhub sync`. The registry URL also pointed to the old `clawhub.com` instead of `clawhub.ai`. <!-- greptile_comment --> <h3>Greptile Summary</h3> Updated `skills/clawhub/SKILL.md` to align with the authoritative documentation in `docs/tools/clawhub.md`. Added missing commands (`sync`, `logout`, `delete`/`undelete`), added missing flags (`--force` for install, `--limit` for search), corrected the registry URL from `clawhub.com` to `clawhub.ai`, and improved documentation structure with consistent `##` headings and additional details about `.clawhub/lock.json` and `--no-input`. <h3>Confidence Score: 5/5</h3> - This PR is safe to merge with no risk - Documentation-only change that adds missing commands and corrects URLs to match authoritative sources. All additions are verified against `docs/tools/clawhub.md` and `CONTRIBUTING.md` - No files require special attention _{Last reviewed commit: 98b0d39} <!-- greptile_other_comments_section --> <!-- /greptile_comment -->