chore(claude): add custom /commit slash command

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.claude/commands/commit.md

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+# Git Commit
+
+Look at all staged changes using `git diff --cached` and create a descriptive git commit message that follows these rules:
+
+- Use conventional commit format: `type(scope): description`
+- Types: feat, fix, docs, refactor, test, chore
+- Keep the subject line under 72 characters
+- Add a short body if the change is complex and needs explanation
+- Be specific about what changed and why
+
+Then run the commit with that message.
+
+## Examples of good commit messages
+- `feat(auth): add JWT token refresh endpoint`
+- `fix(api): handle null response from payment gateway`
+- `refactor(db): extract connection pooling into separate module`
+- `docs(readme): add setup instructions for Windows`
+```
+
+---
+
+**How to run it**
+
+In Claude Code:
+```
+/commit
+```
+
+Or with a hint:
+```
+/commit this fixes the login bug we discussed