fix(insights): cancel the Coach tool-loop provider calls on disconnect

Thread the request abort signal through runCoachToolLoop into each
per-round completion so a mid-generation client disconnect tears down
the upstream call instead of paying the full token cost. Completes the
no-tools-path wiring to cover the tool-retrieval path as well.

Regenerate the OpenAPI spec for the trimmed OCR-capability reason enum.

docs/api/openapi.yaml

@@ -19630,7 +19630,6 @@ components:
             - type: string
               enum:
                 - no-provider
-                - text-only-model
                 - enable-local-ocr
             - type: "null"
         pdfSupported: