test(snapshot): cover tracked undecodable path warnings

[nia-sg-bot]

Summary

• adds a deterministic staged fixture for a tracked non-UTF-8 pathname
• proves that the resolver keeps valid staged file provenance while reporting the invalid pathname as one scoped undecodable_path warning

Part of #21

Validation

• python3 -m pytest (172 passed)
• git diff --check main...HEAD

Remaining work

Issue #21 still tracks the broader comparison-mode and edge-case fixture matrix.

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[nia-sg-bot]

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