fix(ai-skill): prevent security warning in git-commit-format skill

The checklist used backticks around "!" which triggered Claude Code's
security checks to misinterpret it as command execution. Changed to
double quotes to prevent false-positive warnings.

Jira: CNTRLPLANE-1756
Signed-off-by: Antoni Segura Puimedon <[email protected]>
Commit-Message-Assisted-by: Claude (via Claude Code)

Author: celebdor

.claude/skills/git-commit-format/SKILL.md

@@ -123,7 +123,7 @@ When creating commits:
 - [ ] Include `Signed-off-by` footer
 - [ ] Include `Commit-Message-Assisted-by: Claude (via Claude Code)` footer
 - [ ] Validate with `make run-gitlint`
-- [ ] Use `!` or `BREAKING CHANGE` for breaking changes
+- [ ] Use "!" or `BREAKING CHANGE` for breaking changes
 
 ## Reference