Open binary file URL as a card without 415 or hung spinner#4832

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CS-11147-binary-415-fallback

Commits on May 14, 2026

Realm: GET on a binary file with a card Accept falls through to file handler

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Commits on May 18, 2026

Update test for 415 → fallback behavior (Copilot review)

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Host: load binary-extension stack items via the file-meta path

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