feat: add C# and Dart language support

commands/flutter-review.md

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+---
+description: Review Flutter/Dart code for idiomatic patterns, widget best practices, state management, performance, accessibility, and security. Invokes the flutter-reviewer agent.
+---
+
+# Flutter Code Review
+
+This command invokes the **flutter-reviewer** agent to review Flutter/Dart code changes.
+
+## What This Command Does
+
+1. **Gather Context**: Review `git diff --staged` and `git diff`
+2. **Inspect Project**: Check `pubspec.yaml`, `analysis_options.yaml`, state management solution
+3. **Security Pre-scan**: Check for hardcoded secrets and critical security issues
+4. **Full Review**: Apply the complete review checklist
+5. **Report Findings**: Output issues grouped by severity with fix guidance
+
+## Prerequisites
+
+Before running `/flutter-review`, ensure:
+1. **Build passes** — run `/flutter-build` first; a review on broken code is incomplete
+2. **Tests pass** — run `/flutter-test` to confirm no regressions
+3. **No merge conflicts** — resolve all conflicts so the diff reflects only intentional changes
+4. **`flutter analyze` is clean** — fix analyzer warnings before review
+
+## When to Use
+
+Use `/flutter-review` when:
+- Before submitting a PR with Flutter/Dart changes (after build and tests pass)
+- After implementing a new feature to catch issues early
+- When reviewing someone else's Flutter code
+- To audit a widget, state management component, or service class
+- Before a production release
+
+## Review Areas
+
+| Area | Severity |
+|------|----------|
+| Hardcoded secrets, cleartext HTTP | CRITICAL |
+| Architecture violations, state management anti-patterns | CRITICAL |
+| Widget rebuild issues, resource leaks | HIGH |
+| Missing `dispose()`, `BuildContext` after await | HIGH |
+| Dart null safety, missing error/loading states | HIGH |
+| Const propagation, widget composition | HIGH |
+| Performance: expensive work in `build()` | HIGH |
+| Accessibility, semantic labels | MEDIUM |
+| Missing tests for state transitions | HIGH |
+| Hardcoded strings (l10n) | MEDIUM |
+| Pub dependency hygiene | LOW |
+
+## Example Session
+
+````text
+User: /flutter-review
+
+Agent:
+# Flutter Code Review
+
+## Context
+
+Changed files:
+- lib/features/auth/presentation/login_page.dart
+- lib/features/auth/data/auth_repository_impl.dart
+
+State management: Riverpod (detected from pubspec.yaml)
+Architecture: feature-first
+
+## Security Pre-scan
+
+✓ No hardcoded secrets detected
+✓ No cleartext HTTP calls
+
+## Review Findings
+
+[HIGH] BuildContext used after async gap without mounted check
+File: lib/features/auth/presentation/login_page.dart:67
+Issue: `context.go('/home')` called after `await auth.login(...)` with no `mounted` check.
+Fix: Add `if (!context.mounted) return;` before any navigation after awaits (Flutter 3.7+).
+
+[HIGH] AsyncValue error state not handled
+File: lib/features/auth/presentation/login_page.dart:42
+Issue: `ref.watch(authProvider)` switches on loading/data but has no `error` branch.
+Fix: Add error case to the switch expression or `when()` call to show a user-facing error message.
+
+[MEDIUM] Hardcoded string not localized
+File: lib/features/auth/presentation/login_page.dart:89
+Issue: `Text('Login')` — user-visible string not using localization system.
+Fix: Use the project's l10n accessor: `Text(context.l10n.loginButton)`.
+
+## Review Summary
+
+| Severity | Count | Status |
+|----------|-------|--------|
+| CRITICAL | 0     | pass   |
+| HIGH     | 2     | block  |
+| MEDIUM   | 1     | info   |
+| LOW      | 0     | note   |
+
+Verdict: BLOCK — HIGH issues must be fixed before merge.
+````
+
+## Approval Criteria
+
+- **Approve**: No CRITICAL or HIGH issues
+- **Block**: Any CRITICAL or HIGH issues must be fixed before merge
+
+## Related Commands
+
+- `/flutter-build` — Fix build errors first
+- `/flutter-test` — Run tests before reviewing
+- `/code-review` — General code review (language-agnostic)
+
+## Related
+
+- Agent: `agents/flutter-reviewer.md`
+- Skill: `skills/flutter-dart-code-review/`
+- Rules: `rules/dart/`