Prune commentary and stale Rust port notes

server/src/media.rs

@@ -1,15 +1,3 @@
-//! The image types that travel between the phone, the session
-//! directories, and a driver's dialect.
-//!
-//! Media type and file extension have to agree in four places -- storing
-//! an upload, serving it back, handing it to a CLI as a content block, and
-//! saving one a tool produced -- so the table lives here once. The
-//! *default* for an unrecognized type is deliberately not here: it differs
-//! by direction (a phone upload is a photo, a produced image is a
-//! screenshot), so each caller states its own.
-
-/// Media type to extension. Only the types Claude's API accepts as image
-/// content blocks -- anything else has nowhere to go.
 const IMAGE_TYPES: [(&str, &str); 4] = [
     ("image/png", "png"),
     ("image/jpeg", "jpg"),
@@ -56,7 +44,6 @@ mod tests {
     fn unknown_types_are_the_callers_problem() {
         assert_eq!(extension_for("application/pdf"), None);
         assert_eq!(media_type_for("abc123.pdf"), None);
-        // No extension at all -- not "the whole name is the extension".
         assert_eq!(media_type_for("abc123"), None);
     }
 }