#10083: Fix ClawHub link punctuation in skills docs

- Problem: The rendered link includes trailing period (https://clawhub.com.) causing a bad request. - Fix: Wrap the URL in angle brackets so punctuation is excluded: <https://clawhub.com>. <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> This PR updates the ClawHub URL in `docs/tools/skills.md` to use Markdown autolink syntax (`<https://clawhub.com>`) so the trailing sentence period is not included in the hyperlink, preventing users from following a broken `https://clawhub.com.` link in rendered docs. <h3>Confidence Score: 5/5</h3> - This PR is safe to merge with minimal risk. - Single-line documentation-only change that uses standard Markdown autolink syntax to fix an incorrect rendered URL; no runtime code paths are affected. - No files require special attention <!-- greptile_other_comments_section --> _{(2/5) Greptile learns from your feedback when you react with thumbs up/down!} <!-- /greptile_comment -->