feat: add /release claude command for automated releases

.claude/commands/release.md

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+Create a new release for this project. Steps:
+
+1. Fetch tags from all remotes so the version list is current.
+2. Check for uncommitted changes. If any exist, commit them with a clean semantic commit message. No Claude attribution lines.
+3. Review the commits since the last tag. Based on their content, recommend a semver bump:
+   - **major**: breaking/incompatible API changes
+   - **minor**: new features, meaningful new behavior
+   - **patch**: bug fixes, docs, refactoring with no new features
+   Present the proposed version, the bump rationale, and the commit list. Wait for user approval before continuing.
+4. Tag the new version and push the tag + commits to all remotes (origin, gitea, etc.).
+5. Generate release notes from the commits since the last tag, grouped by type (features, fixes, docs/refactoring).
+6. Create a GitHub release using `gh release create`.
+7. Create a Gitea release using `tea releases create` with the same notes.
+8. Report both release URLs and confirm all remotes are up to date.