docs: add verification script to pre-commit checklist

- Add 'Run verification script' as first step in Before Committing
- Add verification script to Phase Completion Verification
- Ensures guideline compliance before commits
- Catches errors early in development workflow
- Verification must pass (0 errors) before declaring complete

PROJECT_GUIDELINES.md

@@ -300,6 +300,8 @@ git checkout -- internal/handlers/auth.go
 - [ ] Verify backward compatibility
 
 ### Before Committing
+- [ ] **Run verification script**: `bash scripts/verify-guidelines.sh`
+- [ ] **Fix any errors** before committing (warnings should be reviewed)
 - [ ] Run tests: `go test ./... -v`
 - [ ] Run lint/typecheck if available
 - [ ] Ensure no secrets in changes
@@ -327,6 +329,7 @@ git checkout -- internal/handlers/auth.go
 - [ ] No unintended code was deleted
 - [ ] All affected files compile successfully
 - [ ] Run `go build ./...` for entire project
+- [ ] **Run verification script**: `bash scripts/verify-guidelines.sh` - must pass (0 errors)
 - [ ] No critical functionality was broken
 - [ ] Git diff shows only intended changes
 - [ ] Review all modified files with `git diff --stat`