Fix tasks board WS idle timeouts and Mira pipeline kicks.

Reset read deadline on server Ping (not only Pong), run OnEvent async so long replies do not stall the socket, and always answer clear Mira delivery asks instead of LLM decide-gate skips.

internal/tasksws/client.go

@@ -111,6 +111,12 @@ func (c *Client) session(ctx context.Context, since *int64) error {
 	defer conn.Close()
 
 	_ = conn.SetReadDeadline(time.Now().Add(90 * time.Second))
+	// Server sends Ping; gorilla delivers it as Ping (not Pong). Reset deadline or
+	// idle boards die every ~90s with "i/o timeout" despite healthy pings.
+	conn.SetPingHandler(func(appData string) error {
+		_ = conn.SetReadDeadline(time.Now().Add(90 * time.Second))
+		return conn.WriteControl(websocket.PongMessage, []byte(appData), time.Now().Add(10*time.Second))
+	})
 	conn.SetPongHandler(func(string) error {
 		_ = conn.SetReadDeadline(time.Now().Add(90 * time.Second))
 		return nil
@@ -146,9 +152,13 @@ func (c *Client) session(ctx context.Context, since *int64) error {
 			*since = ev.Seq
 		}
 		if c.OnEvent != nil {
-			if err := c.OnEvent(ctx, ev); err != nil && c.Log != nil {
+			ev := ev
+			hctx := context.WithoutCancel(ctx)
+			go func() {
+				if err := c.OnEvent(hctx, ev); err != nil && c.Log != nil {
 					c.Log.Warn("tasks ws handler", "error", err, "type", ev.Type)
 				}
+			}()
 		}
 	}
 }