Reject oversized PDF renders before bitmap allocation

[CyMule]

Summary

• pass the configured PDF render pixel limit into unstructured-inference
• map oversized PDF render failures to UnprocessableEntityError
• add coverage for filename/file-object paths and render-limit error handling

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Note

Medium Risk
Changes hi-res PDF inference/rendering behavior by enforcing a per-page pixel cap and remapping upstream render failures to UnprocessableEntityError, which could alter error surfaces for some PDFs. Dependency bump to unstructured-inference may also change model/render behavior across platforms.

Overview
Prevents OOM/unsafe rendering for hi-res PDFs by passing a new PDF_RENDER_MAX_PIXELS_PER_PAGE limit through to unstructured-inference during hi-res partitioning and PDF-to-image conversion.

When unstructured-inference raises PdfRenderTooLargeError, the code now converts it into an UnprocessableEntityError so oversized pages fail fast with a consistent “unprocessable document” error instead of attempting bitmap allocation.

Bumps the unstructured-inference dependency (and lockfile resolutions) and adds tests covering both filename/file-object paths and the new oversized-render error handling.

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