Add FlashMLA flashmla runtime path audit

[ghangz]

Summary

• Adds a focused flashmla runtime path audit improvement for MetaX-MACA/FlashMLA.
• 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: FlashMLA_TileLang_20260701, 3/3 PASS; PyTorch-MACA batch also covered FlashMLA tools.
• Branch validation command: python tools/runtime_path_audit.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/flashmla-runtime-path-audit
• Target branch: MetaX-MACA/FlashMLA:main
• 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/runtime_path_audit.py, designed to audit MACA-related environment path variables for duplicate or non-existent entries. Feedback on the implementation suggests using os.path.normpath to ensure redundant path segments are fully normalized when checking for duplicates, and replacing the assert statement in the self-test with an explicit conditional check and exception to prevent it from being bypassed under Python optimization flags.

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[gemini-code-assist]

Using str(Path(raw)) does not fully normalize redundant path segments like . or .. (for example, /usr/local/lib/../lib is not collapsed). To reliably detect duplicate entries regardless of formatting, use os.path.normpath(raw) instead.

Suggested change

	normalized = str(Path(raw))
	normalized = os.path.normpath(raw)

[gemini-code-assist]

Using assert statements for runtime validation or self-tests is discouraged in production code because they can be globally disabled when Python is run with optimization flags (e.g., python -O). Instead, use an explicit conditional check and raise an appropriate exception (like RuntimeError).

Suggested change

	assert data["finding_count"] >= 2
	if data["finding_count"] < 2:
	raise RuntimeError(f"Self-test failed: expected at least 2 findings, got {data['finding_count']}")