Iron Law: Never delete code labeled as duplicate without verifying all call sites are updated; always confirm zero remaining references before removing.

Code Deduplication Skill

Purpose

Provides systematic methodology for detecting code duplication, unused code, and dependency bloat -- primarily in Flutter + Firebase codebases but applicable to any project.

Process

1. Discover -- Map project structure, features, shared utilities, and test coverage
2. Scan -- Run multi-phase analysis for duplicates, dead code, and unused dependencies
3. Classify -- Categorize findings by severity (Critical / Warning / Suggestion)
4. Report -- Output structured report with file locations, counts, and recommendations

For the complete analysis methodology, detection patterns, and report format:

Read reference/dedup-analysis-methodology.md