- upstreamPath rejects '..' in model ids AND in the rest path — the rest
can embed SERVER-SUPPLIED components (ACE-Step result file URLs), so
dot-dot/scheme smuggling toward other proxy endpoints is refused
- singleImageResult requires positive image evidence (sniffed magic OR
declared image/*): an empty-Content-Type error page can no longer pass
as 'the image' via sniffImageMIME's PNG-default labelling
- upscale/background responses get a dedicated 256MB cap (the 64MB cap
is JSON-sized; a 4x PNG legitimately exceeds it)
- mesh JSON-detection widened (512-byte whitespace-tolerant peek + reject
declared application/json)
- Transcribe now reuses buildMultipart; transcriptionFilename takes
(filename, mime) so diarize shares it without a fake request struct;
truncateForError stops shadowing builtin cap; OnlyMask doc de-ambiguated
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>