Detect .exr and .hdr image outputs before normal Job Monitor thumbnail rendering, and show explicit source-preview fallback tiles instead of broken image elements.
Keep normal image thumbnails plus existing media and asset fallback behavior intact, and document the HDR fallback posture.
Validation: targeted Vitest, R107 Playwright, doc-contract checks, and the full Windows test gate passed.
Keep filename-backed output references previewable when hosts omit hash metadata, while preserving the explicit no-go path for asset-only references.
Update public docs and generated OpenAPI contract to describe optional hash metadata and the ComfyUI asset hashing flag.
Validation: targeted backend/unit/E2E checks passed; full Windows test gate passed.
rookiestar28