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Greptile Summary

This PR refactors ExtractionFormat::extension() to derive its return value from the enum's Display implementation rather than maintaining a parallel match arm per variant. To make that safe, explicit to_string annotations are added to every multi-alias variant, pinning the canonical display string independently of serialization order.

• extension() is simplified from a 19-arm match to a single .then(|| self.to_string()) expression, and its return type changes from Option<&'static str> to Option<String>.
• Zip gains an explicit to_string = "zip" to prevent the longer vsix alias from ever being selected as Display by strum.
• A new test verifies that to_string on the key tar variants and Zip returns the expected canonical extension, and that Raw returns None.

Confidence Score: 5/5

Safe to merge — pure refactor with no behavior changes; all callers of extension() are updated and the new logic is verified by an existing + new test.

The change replaces a hand-maintained 19-arm match with a one-liner backed by strum's Display, which is already tested by the new test_extraction_format_extension_uses_canonical_display test. The only API-surface change (return type &'static str → String) has exactly one other call site (http.rs), which is correctly updated in the same PR. No logic is altered — every variant that previously returned Some("…") still returns the same string, and Raw still returns None.

No files require special attention.

Important Files Changed

_{Reviews (2): Last reviewed commit: "refactor(file): derive extraction format..." | Re-trigger Greptile}