feat(command): Add fix-issue command

.claude/commands/fix-issue.md

@@ -0,0 +1,39 @@
+---
+description: Fix an issue and open a PR
+---
+
+Fix issue #$1 in this repository.
+
+## Steps
+
+1. Read the issue: `gh issue view $1 --comments`.
+   If screenshots are attached, analyse them carefully.
+2. Find the relevant files. Use Glob and Grep, read before editing.
+3. Create a branch off main: `git checkout -b agent/ui-fix-$1 main`
+4. Implement the fix.
+   - Use existing design tokens and utility classes, never hardcoded
+     hex colours or pixel values.
+   - Touch only UI/styling files. Do not change business logic,
+     API calls, or auth.
+   - Keep the change as small as the issue requires.
+5. Verify: `npm run lint` and `npm run build` must both pass.
+   Fix anything you broke before continuing.
+6. Commit and push:
+   `git add -A && git commit -m "fix: <short description>"`
+   `git push -u origin HEAD`
+7. Open the PR:
+   `gh pr create --base main --title "fix: <short description>" --body "..."`
+   The body must contain `Closes #$1` and explain what changed and why.
+
+## Non-interactive
+
+This runs in GitHub Actions. Nobody will answer questions.
+
+If the issue is too ambiguous to fix safely, do NOT change code.
+Instead: comment on the issue explaining what's unclear, add the
+`agent-needs-human` label, and stop.
+
+## Done means
+
+A pushed branch AND an open PR. Editing files without opening a PR
+is a failed run.