Two asks that turned out to be about the same thing: a request taken as meant.

A model fine-tuned on a quality ladder needs that ladder on every request, and
a client speaking the plain OpenAI image API sends a sentence with nowhere to
put it. CoderAI adds no tags of its own and still does not: prompt_prefix and
negative_prompt_prefix on the MODEL's config entry are comma-joined in front of
whatever the caller sent, and both default to empty, so an install that
configures nothing sends exactly what was written. A request overrides either,
and an empty string switches one off for that call -- what a caller writing its
own complete prompt needs. Applied at most once: a prompt that already opens
with the ladder is left alone rather than given it twice, which would only
dilute the rest.

The prefix resolves once, before the encode, and the same text feeds the
embedding cache key. Keyed on the prompt as SENT, two models with different
prefixes would share one entry and the second would be served the first's
text. The archive keeps the prompt that ran plus the one requested when they
differ.

On OCR: there is no per-page byte limit, and there never was. A page over a
megabyte is ordinary -- an A4 scan at 300 DPI is several -- and both a 3 MB and
a 50 MB body upload completely and are rejected only at authentication, with
the bundled nginx at 4096m and the generated /v1/ocr routing not lowering it.

What did exist was a hardcoded 100 MB ceiling on one document, which a 300 DPI
colour filing passes without being unusual and which nothing could raise. It is
ocr.max_upload_mb now (0 = no ceiling here), in Settings, and its 413 names the
setting and says the document was NOT read -- the loud refusal ocr.max_pages
already makes, instead of "file too large (max 100 MB)".

The 1 MB figure that makes a large page fail in the field is nginx's own
client_max_body_size default, in a reverse proxy added in front. That is
exactly the shape of "anything over a megabyte fails", so it is recorded in the
code, the settings hint and docs/ocr.md rather than left to be rediscovered.
Also documented there: what IS capped is pixels, not bytes -- Surya-2 and
Chandra top out near 6.29 MP, an A4 page at about 255 DPI, and above that the
page is silently downscaled to fit.

37 tests, including a real 1.25 MB single-page PDF built from noise and read
back through pdfium as one page. Full suite 4512 passed with the same 15
pre-existing failures as 0.4.90 (diff empty).
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S8LAP3ueNzQJtwzhgVbq66