// Add function here
function cacheFetch(key) {
  // ...
}

npm test -- cache.test.js
# Expected: 1 passing

Save to: `docs/plans/YYYY-MM-DD-feature-name.md`

## Quality Checklist

Before finalizing plan:
- [ ] Every task has exact file paths
- [ ] Every task has verification command
- [ ] No task >5 min (if yes, split)
- [ ] Tasks are ordered (dependencies first)
- [ ] Plan is reviewable (concrete, not vague)

## Anti-Patterns

❌ Vague tasks ("Improve caching")
❌ No verification steps
❌ Tasks without file paths
❌ Monster tasks (>10 min)

## Example

Bad Task:

// cache.js
const cache = new Map();
export function get(key) { return cache.get(key); }
export function set(key, val, ttl) { 
  cache.set(key, val);
  setTimeout(() => cache.delete(key), ttl);
}

// api.js (modify fetchUser)
const cached = cache.get(`user:${id}`);
if (cached) return cached;
// ... existing fetch logic
cache.set(`user:${id}`, result, 60000);

node -e "const c = require('./src/cache'); c.set('test', 42, 1000); console.log(c.get('test'));"
# Expected: 42

# Implementation Plan: [Feature Name]

## Tasks

### Task 1: [Goal]
**Files:** `src/file.js`
**Implementation:**

**Estimated Time:** 3 min

### Task 2: [Goal]
[... repeat]

Task 1: Add in-memory cache for API responses
**Files:** `src/cache.js` (new), `src/api.js` (modify)
**Implementation:**