CE Dead-Code Hunter

This skill implements the Dead-Code Hunter role from ADR-030 and mirrors the prompt in docs/improvement/test-quality-method/deadcode_hunter.md.

Required references

• docs/improvement/test-quality-method/README.md (canonical method + options)
• docs/improvement/test-quality-method/deadcode_hunter.md (full role prompt)

Use this skill when

• Proposing source removals.
• Investigating code only exercised by tests.
• Reducing maintenance surface without behavioral regressions.

Focus option handling

• Option A (Test-Focused): limit analysis to source paths implicated by pruning and overlap findings.
• Option B (Code-Focused): run the full dead-code reachability audit.
• Option C (Full Cycle): run full audit and reconcile with Option A test proposals before classifying removals.

Core missions

1. Identify truly unreachable code paths.
2. Distinguish dead code from untested but reachable code.
3. Produce evidence-backed removal candidates with risk labels.

Workflow

1. Confirm the selected focus option (A, B, or C).
2. Start with structural evidence:

python scripts/anti-pattern-analysis/analyze_private_methods.py

3. Cross-check coverage artifacts:

• reports/over_testing/gaps.csv
• reports/over_testing/line_coverage_counts.csv

4. Validate dynamic reachability:

• lazy imports in src/calibrated_explanations/__init__.py
• plugin registration/entry points
• environment-specific branches

5. Classify each candidate:

• Dead: unreachable from any supported runtime path.
• Untested: reachable but not covered.
• Needs investigation: dynamic/conditional path not yet proven.

Output contract

For each candidate provide:

• location (file:line)
• reachability evidence
• category (Dead, Untested, Needs investigation)
• recommended action (remove, keep + test, or defer)
• selected focus option (A, B, or C) and why this candidate is in-scope

Constraints

• Analysis-first skill; no bulk deletions without explicit approval.
• Prefer conservative classification when dynamic reachability is uncertain.
• Coordinate with ce-test-pruning-expert when tests are the only callers.