Add mcTVM mctvm build artifact manifest

[ghangz]

Summary

• Adds a focused mctvm build artifact manifest improvement for MetaX-MACA/mcTVM.
• The change targets MetaX MACA development and validation workflows, with emphasis on earlier diagnostics, reproducible logs, or safer benchmark tooling.
• Existing default behavior is kept compatible; the new logic is scoped to explicit checks, helper tools, or validation metadata.

Validation

• Verified on Gitee.AI MetaX GPU resources: mctvm_TileLang_20260701, 6/6 PASS.
• Branch validation command: python tools/maca_artifact_manifest.py --self-test
• Pull request text is intentionally ASCII-only to avoid encoding issues on web forms and API clients.

Review notes

• Source branch: ghangz:mengz/mctvm-build-artifact-manifest
• Target branch: MetaX-MACA/mcTVM:dev
• Maintainers can modify this branch if follow-up adjustments are needed.

[gemini-code-assist]

Code Review

This pull request introduces a new Python script, tools/maca_artifact_manifest.py, designed to generate a reproducible artifact manifest containing file sizes and SHA-256 hashes. Feedback on the implementation suggests validating that the provided root path exists and is a directory to avoid silent failures, and replacing the assert statement in the self-test function with an explicit runtime check to ensure it is not bypassed when Python is run with optimization flags.

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[gemini-code-assist]

The collect function does not validate whether the provided root path exists and is a directory. If an invalid or misspelled path is passed, root.glob() will silently return an empty list, producing an empty manifest without any warning or error. This can lead to hard-to-detect failures in CI/CD pipelines. Consider validating that root is an existing directory before proceeding.

def collect(root: Path) -> dict[str, object]:
    if not root.is_dir():
        raise FileNotFoundError(f"The root path '{root}' does not exist or is not a directory.")
    seen: set[str] = set()

[gemini-code-assist]

Avoid using assert statements for runtime validation or self-tests in executable scripts. When Python is run with optimization flags (e.g., python -O), all assert statements are compiled away and ignored, which would cause this self-test to silently pass even if the validation fails. Use an explicit if condition and raise an exception (such as RuntimeError) instead.

Suggested change

	assert any(item["path"] == sample.name for item in data["artifacts"])
	if not any(item["path"] == sample.name for item in data["artifacts"]):
	raise RuntimeError("Self-test failed: sample artifact not found in manifest")