[CleanCut]

This is a test-only change.

Test that inspecting a version file in an S3 store fails with the store's error when a read fails partway through the file, rather than inspecting it as a file with no metadata. The in-process S3 test server gets a switch that refuses every ranged read not starting at an object's first byte, and the S3 formats test turns it on to inspect a Parquet file whose footer Polars reads past the first fetch.

ENG-2356

[coderabbitai]

📝 Summary

Summary by CodeRabbit

• Tests
  • Expanded coverage for cloud storage reads that fail when requesting data from the middle of a file, including checks that inspection reports the resulting error.

The S3 test fixture can now reject ranged reads that start after byte zero. The inspection helper returns errors to its callers, and the format-read test checks that a refused read is returned as an inspection error.

Changes: S3 ranged-read error handling

Layer / File(s)	Summary
Configurable ranged-read refusal crates/liboxen/src/storage/s3.rs	The test server can reject ranged reads that start after byte zero. Fixture setup exposes the refusal switch, and other tests disable it.
Inspection error propagation crates/liboxen/src/storage/s3.rs	The inspection helper returns a Result. The format-read test checks the error from a refused Parquet read, and other callers handle inspection success or failure.

Priority: Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Merge Risk: Minimal · up to 1e96a

No merge-blocking risk was identified in this test-only change.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title clearly identifies an S3 test for failure when a stored file read fails partway through. It matches the main changeset.
Description check		The description accurately explains the test-only S3 change, the ranged-read failure behavior, and the expected inspection error.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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