fix: mark incomplete sharded scans inconclusive

[mldangelo-oai]

Summary

• require exact shard filename matches and record expected-vs-present shard coverage
• mark missing or failed shard scans as inconclusive metadata instead of security warnings
• skip caching explicit incomplete, inconclusive, or operational scan metadata

Validation

• uv run pytest tests/utils/file/test_advanced_file_handler.py::TestShardedModelDetector::test_detect_shards_records_missing_expected_indices tests/utils/file/test_advanced_file_handler.py::TestShardedModelDetector::test_detect_shards_ignores_suffix_near_matches tests/utils/file/test_advanced_file_handler.py::TestAdvancedFileHandler::test_sharded_model_missing_shards_marks_scan_inconclusive tests/utils/file/test_advanced_file_handler.py::TestAdvancedFileHandler::test_parallel_shard_errors_mark_scan_inconclusive tests/cache/test_cache_correctness.py::test_cached_scan_skips_persisting_incomplete_metadata
• uv run pytest tests/utils/file/test_advanced_file_handler.py tests/utils/file/test_large_file_handler.py tests/cache/test_cache_correctness.py
• uv run ruff format modelaudit/ packages/modelaudit-picklescan/src packages/modelaudit-picklescan/tests tests/
• uv run ruff check --fix modelaudit/ packages/modelaudit-picklescan/src packages/modelaudit-picklescan/tests tests/
• uv run mypy modelaudit/ packages/modelaudit-picklescan/src packages/modelaudit-picklescan/tests tests/
• uv run pytest -n auto -m "not slow and not integration" --maxfail=1
• uv run ruff format --check modelaudit/ packages/modelaudit-picklescan/src packages/modelaudit-picklescan/tests tests/
• uv run ruff check modelaudit/ packages/modelaudit-picklescan/src packages/modelaudit-picklescan/tests tests/
• git diff --check

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 4b69af4c-d9c7-4bd8-8cc3-4484e5763e75

📥 Commits

Reviewing files that changed from the base of the PR and between f285a05 and 51ad2c4.

📒 Files selected for processing (5)

• CHANGELOG.md
• modelaudit/cache/cache_policy.py
• modelaudit/utils/file/handlers.py
• tests/cache/test_cache_correctness.py
• tests/utils/file/test_advanced_file_handler.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch mdangelo/codex/sharded-scan-outcome-audit

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[github-actions]

Workflow run and artifacts

Performance Benchmarks

Compared 6 shared benchmarks with a regression threshold of 15%.
Status: 0 regressions, 0 improved, 6 stable, 0 new, 0 missing.
Aggregate shared-benchmark median: 692.73ms -> 677.23ms (-2.2%).

Benchmark	Target	Size	Files	Baseline	Current	Change	Status
tests/benchmarks/test_scan_benchmarks.py::test_detect_file_format_safe_pickle	safe_model.pkl	49.4 KiB	1	167.2us	161.9us	-3.2%	stable
tests/benchmarks/test_scan_benchmarks.py::test_scan_duplicate_directory	duplicate-corpus	840.0 KiB	81	492.81ms	480.02ms	-2.6%	stable
tests/benchmarks/test_scan_benchmarks.py::test_validate_file_type_pytorch_zip	state_dict.pt	1.5 MiB	1	48.2us	49.2us	+2.2%	stable
tests/benchmarks/test_scan_benchmarks.py::test_scan_mixed_directory	mixed-corpus	1.7 MiB	54	138.29ms	135.53ms	-2.0%	stable
tests/benchmarks/test_scan_benchmarks.py::test_scan_pytorch_zip	state_dict.pt	1.5 MiB	1	33.54ms	33.67ms	+0.4%	stable
tests/benchmarks/test_scan_benchmarks.py::test_scan_safe_pickle	safe_model.pkl	49.4 KiB	1	27.87ms	27.80ms	-0.2%	stable

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 0b3d399797

ℹ️ About Codex in GitHub

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• Mark a draft as ready
• Comment "@codex review".

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