Add minimality A/B benchmark harness (closes #312)

[azalio]

Summary

• Adds src/mapify_cli/minimality_eval.py — a deterministic A/B benchmark harness that proves MAP minimality is active and isolated without live model calls or external services.
• Adds tests/test_minimality_eval.py — 28 tests covering all acceptance criteria (VC1–VC14).

What the harness does

1. Contamination isolation — builds the MAP_Minimality_Doctrine context block for each arm and asserts:

   • minimality: off arm → doctrine tag absent (hard FAIL on contamination)
   • minimality: lite/full/ultra arm → doctrine tag present (hard FAIL on contamination)

2. Fixture corpus (three tasks, no external services):

   • OVER_BUILD_TRAP — stdlib/native reuse should win; treatment uses urllib.parse.quote, baseline hand-rolls encoding. Verifies treatment produces fewer LOC.
   • SAFETY_GUARD — path-traversal guard must survive in both arms (PermissionError, startswith, realpath required). Hard FAIL if any pattern is dropped.
   • IRREDUCIBLE — both arms produce a minimal pytest fixture. LOC swing warns (not fails) since no bloat exists to cut.

3. Metrics split — report separates code-size/cost (loc, LOC delta) from correctness/safety (missing_patterns, contaminated).

4. Report persistence — JSON written to .map/eval-runs/minimality/<iso_timestamp>.json.

Usage

python -m mapify_cli.minimality_eval           # off vs lite
python -m mapify_cli.minimality_eval --full    # off vs lite vs full
python -m mapify_cli.minimality_eval --show    # also print JSON to stdout
python -m mapify_cli.minimality_eval --out DIR # custom output directory

Test plan

• uv run pytest tests/test_minimality_eval.py -v — 28 passed
• uv run ruff check src/mapify_cli/minimality_eval.py tests/test_minimality_eval.py — all checks passed
• uv run python -m pyright src/mapify_cli/minimality_eval.py tests/test_minimality_eval.py — 0 errors
• uv run make check — 3370 passed, 4 skipped

Closes #312

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📥 Commits

Reviewing files that changed from the base of the PR and between 5bf92dc and 96c3233.

📒 Files selected for processing (2)

• src/mapify_cli/minimality_eval.py
• tests/test_minimality_eval.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/compassionate-cerf-5tugql

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