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## Why Path-backed feedback attachments were always labeled `text/plain`, even when the attached file was a gzip archive. Sentry consumers could therefore UTF-8-decode a valid Codex Desktop log bundle and corrupt the transferred bytes before anyone inspected it. Desktop already creates a valid archive and sends its path through `feedback/upload`; the bad metadata was assigned later by app-server's feedback upload path. Slack investigation: https://openai.slack.com/archives/C09NZ54M4KY/p1782867266569699 ## What changed Path-backed feedback attachments now derive their MIME type from the final uploaded filename. Gzip files use `application/gzip`, known text formats remain text, and unrecognized files use the safe `application/octet-stream` fallback. Attachment filenames and bytes are unchanged. ## How it works - **Classify at the upload boundary:** The feedback crate selects MIME metadata after resolving the final filename, including filename overrides. - **Preserve text rollouts:** Codex `.jsonl` rollouts remain `text/plain`, while other known formats use the repository's existing `mime_guess` mapping. - **Protect unknown binaries:** Unrecognized extensions fall back to `application/octet-stream` instead of being treated as UTF-8 text. - **Keep the wire stable:** `feedback/upload` still accepts the same path list, so Desktop, generated protocol surfaces, and remote-host minimums do not change. ## Verification Added focused coverage for gzip MIME, unknown binary fallback, `.jsonl` text handling, and exact filename/byte preservation. Ran the complete `codex-feedback` test suite (9 tests), crate-scoped Clippy, Rust formatting, Bazel lock refresh, and diff checks successfully.