Add tea comment command documentation

- Add Comments section to gitea skill with examples
- Update code-reviewer agent with explicit tea CLI commands
  for posting comments, approving, and merging PRs

Closes #6

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

skills/gitea/SKILL.md

@@ -112,6 +112,22 @@ tea repos <owner>/<repo>             # Repository info
 tea clone <owner>/<repo>             # Clone repository
 ```
 
+### Comments
+
+```bash
+# Add comment to issue or PR
+tea comment <number> "<comment body>"
+tea comment 3 "LGTM, ready to merge"
+
+# Multiline comments (use heredoc)
+tea comment 3 "$(cat <<'EOF'
+## Review Summary
+- Code looks good
+- Tests pass
+EOF
+)"
+```
+
 ### Notifications
 
 ```bash