9router-project-checker

# Project Checker

Automatically build, test, and review the 9Router project.

## Workflow

Follow this exact sequence:

### 1. Run Build
```bash
npm run build
```
Check for any build errors. Report success or failure immediately.

### 2. Run Lint (if requested or on commit)
```bash
npx eslint . 2>&1 | head -50
```
Report lint errors if any.

### 3. Run Tests
```bash
npx vitest run
```
Report test results - passed/failed counts.

### 4. Review Changes (if git changes exist)
Check for uncommitted or unpushed changes:
```bash
git status --short
git diff --cached
git diff
```

Review the changes following these guidelines:
- **Bugs**: Logic errors, off-by-one, incorrect conditionals, null/empty/undefined handling
- **Security**: Injection, auth bypass, data exposure
- **Structure**: Does code follow existing patterns? Are there established abstractions?
- **Performance**: Flag if obviously problematic (O(n²), N+1 queries)
- **Behavior Changes**: Note if changes alter existing behavior

### 5. Provide Report

Format the report as:
```
## Project Check Results

### Build: ✅ PASS / ❌ FAIL
[summary]

### Lint: ✅ PASS / ⚠️ WARNINGS / ❌ ERRORS
[count and key issues if any]

### Tests: ✅ PASS (X/Y) / ❌ FAIL (X/Y)
[failed tests if any]

### Code Review: 
[for each file changed]
- **File**: filename
- **Issues**: [list issues found with severity: HIGH/MEDIUM/LOW]
- **Notes**: [behavioral changes, if any]

## Summary
[overall assessment]
```

## Severity Guidelines

- **HIGH**: Security vulnerability, data loss, complete breakage
- **MEDIUM**: Feature broken, partial failure, missing router.refresh()
- **LOW**: Code style, minor improvement, silent error swallowing

## Error Handling

If any step fails:
1. Report the failure immediately with error message
2. Do NOT continue to next steps
3. Ask user if they want to fix before continuing

## Context

This project uses:
- Next.js 16 with App Router
- Vitest for testing
- ESLint for linting
- lowdb + better-sqlite3 for data persistence
- JWT auth with httpOnly cookies