feat(commands): add quality-loop slash command

Adds a slash command that runs the quality-scan skill iteratively,
fixing all issues found until zero remain or 5 iterations complete.

Author: jdalton

.claude/commands/quality-loop.md

@@ -0,0 +1,18 @@
+Run the quality-scan skill and fix all issues found. Repeat until zero issues remain or 5 iterations complete.
+
+## Process
+
+1. Run quality-scan skill
+2. If issues found: fix ALL of them
+3. Run quality-scan again
+4. Repeat until:
+   - Zero issues found (success), OR
+   - 5 iterations completed (stop)
+5. Commit all fixes with message: "fix: resolve quality scan issues (iteration N)"
+
+## Rules
+
+- Fix every issue, not just "easy" ones
+- Do not skip architectural fixes
+- Run tests after fixes to verify nothing broke
+- Track iteration count and report progress