Find Code Duplication

Detect duplicated or near-duplicate Go code and suggest consolidation candidates.

Rules

• Report findings, do not refactor. Refactoring is a separate task.
• Focus on production code (internal/, api/, cmd/). Skip test duplication unless explicitly asked.
• Group findings by severity: exact duplicates first, then near-duplicates.
• For each finding, state whether extraction is worth it or acceptable duplication.

Step 1: Determine Scope

Ask the user:

• Branch mode: only files changed in the current branch vs main.
• Full mode: scan the entire codebase.

For branch mode: