The image-rejection recovery no longer switches the session to
text-only or strips history; it records the (provider, model) and
build_api_request strips images from that model's requests only. Three
places still described the old behaviour:
- recover_before_classification docstring and the adjacent comment said
"switch session to text-only" / "mark session vision-unsupported".
- TestStripImagesDropsStaleApiContent's rationale claimed the strip runs
on persistent history and that leaving api_content would replay
rejected images every turn because the recovery gates on
_image_rejecting_models — false on both counts: current callers pass
per-call clones. Reworded as the generic helper contract (a rewritten
persisted row must drop its sidecar) with the no-op note.
- _strip_images_from_messages docstring, same fix.
Comments and docstrings only; no code change.
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