Add an opt-in in-browser OCR path so a user whose provider cannot read
images (ChatGPT-OAuth/Codex, a text-only model) can still scan a lab
report. The capability probe gains a `mode` field: `vision` when the
provider reads the image directly, `text` when local OCR is enabled and
any provider is configured, or null. The extract route grows a text
branch that accepts the in-browser-OCR'd text as JSON and structures it
through the existing schema + review/commit flow; the raw image never
reaches the server in text mode. New `labsLocalOcrEnabled` user column
(migration 0184, default off) gates it, with a dedicated PATCH endpoint.
Add the OcrCapability, OcrExtract, and OcrCommit operations under
/api/labs/ocr/* and regenerate the YAML. Document the multipart upload, the
untrusted-extraction contract, and the source OCR commit value. Mark the three
routes exempt in the module-route gate inventory under the labs data-layer
reasoning.
Marc-André Bombeck