fix: monkey-patch mcp cancellation race crash (SDK issue #2416)

Patch RequestResponder.respond() and cancel() at startup to handle
the race where a notifications/cancelled arrives between handler
return and respond(), which crashes the session with
"AssertionError: Request already responded to".

Also improve build.sh to handle registry push failures gracefully
and auto-restart the container after building.

scripts/build.sh

@@ -6,6 +6,7 @@ PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
 SCRAPER_DIR="/home/b3nw/projects/financial/schwab-scraper"
 IMAGE="gitea.ext.ben.io/b3nw/schwab-mcp-custom:latest"
 BUILD_HOST="${BUILD_HOST:-docker-test}"
+COMPOSE_DIR="/opt/schwab-mcp-custom"
 
 cd "$PROJECT_DIR"
 
@@ -28,10 +29,17 @@ echo "==> Building Docker image on $BUILD_HOST..."
 ssh "$BUILD_HOST" "cd /tmp/schwab-mcp-build && docker build -t $IMAGE ."
 
 echo "==> Pushing image to registry..."
-ssh "$BUILD_HOST" "docker push $IMAGE"
+if ssh "$BUILD_HOST" "docker push $IMAGE" 2>/dev/null; then
+    echo "    Image pushed to registry."
+else
+    echo "    Registry push failed (auth?), image available locally only."
+fi
+
+echo "==> Restarting container..."
+ssh "$BUILD_HOST" "cd $COMPOSE_DIR && docker compose up -d --force-recreate --pull never --no-deps schwab-mcp"
 
 echo "==> Cleaning up..."
 rm -rf vendor/schwab-scraper
 ssh "$BUILD_HOST" "rm -rf /tmp/schwab-mcp-build"
 
-echo "==> Done! Image pushed: $IMAGE"
+echo "==> Done! Container restarted with new image."