# Dead Code Review Lens

Review the provided code for **unused, unreachable, or obsolete code**.

## What to Look For

### Zombie Code
- Commented-out code blocks (should be deleted, git has history)
- Functions/methods that are defined but never called
- Exported symbols that are never imported elsewhere
- Variables assigned but never read
- Parameters passed but never used

### Unreachable Code
- Code after unconditional return/throw/break
- Branches that can never execute (dead conditions)
- Error handlers for errors that can't occur
- Feature flags that are always on/off

### Obsolete Code
- Compatibility shims for deprecated dependencies
- Polyfills for features now universally supported
- Migration code that has already run
- TODO comments older than 6 months with no activity
- Version checks for versions no longer supported

### Import/Dependency Cruft
- Imported modules that are never used
- Dependencies in package manifest but unused in code
- Conditional imports that never trigger

## Output Format

For each finding:
```
[DEAD] <severity:HIGH|MED|LOW> <file:line>
Type: <zombie|unreachable|obsolete|cruft>
Issue: <what's dead>
Evidence: <how you know it's unused>
Suggest: <delete|archive|verify-then-delete>
```

## Guidelines

- HIGH = definitely dead, safe to delete
- MED = likely dead, needs verification (grep for dynamic usage)
- LOW = possibly dead, context-dependent
- Be careful with: reflection, dynamic imports, CLI entrypoints, test fixtures
- When uncertain, suggest verification steps rather than immediate deletion