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:

src/app/api/insights/chat/route.ts

@@ -549,6 +549,9 @@ Reply now as the assistant, in ${locale === "de" ? "German" : "English"}. Fetch
         temperature: AI_BUDGETS.coach.temperature,
         maxTokens: AI_BUDGETS.coach.maxTokens,
         fallbackWindow: effectiveScope?.window,
+        // v1.20.1 — thread the abort signal so a mid-generation disconnect tears
+        // down the per-round provider calls instead of paying the full cost.
+        signal: request.signal,
       });
       result = loop.result;
       workingProviderType = loop.workingProviderType;

src/lib/ai/coach/tools/loop.ts

@@ -58,6 +58,8 @@ export async function runCoachToolLoop(args: {
   maxTokens?: number;
   fallbackWindow?: CoachScopeWindow;
   ledger?: ProviderHealthLedger;
+  /** Aborts the per-round provider calls on client disconnect. */
+  signal?: AbortSignal;
 }): Promise<CoachToolLoopResult> {
   const {
     userId,
@@ -68,6 +70,7 @@ export async function runCoachToolLoop(args: {
     maxTokens,
     fallbackWindow,
     ledger,
+    signal,
   } = args;
 
   const messages: AiMessage[] = [...args.messages];
@@ -92,6 +95,7 @@ export async function runCoachToolLoop(args: {
         messages,
         temperature,
         maxTokens,
+        signal,
         ...(offerTools
           ? { tools, toolChoice: "auto" as const }
           : { toolChoice: "none" as const }),