Attachments: bound page renders, resolve once, no images for blind models

From review. A PDF page rendered at 150 dpi had no size bound: a 3000 pt
page came out 6250x6250 at 171 MB, past the 20 MB cap an image file has;
renders are now scaled to 2048 and refused over the cap. Images resolved
on every tool round re-read files and re-rendered pages between rounds,
and could flip to gone mid-answer; they resolve once per answer. A
conversation holding images, reopened with a text-only model loaded, sent
image parts the server rejected; the references become a note instead.
Scanned pages past the fourth were dropped silently; they are listed as
not shown and the chip is truncated. A pdftotext timeout or a missing
poppler is a refusal, newlines in a name no longer close the file block,
an image is hashed from the bytes it sends, and /models is read once per
answer.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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