feat: improve batch task controls and release 1.2.0

mcp_server/tools/task_manager.py

@@ -282,8 +282,10 @@ def mobile_manage_task(
     - **'resume'**: Queues a paused task for its device again; optional `instruction`
       provides guidance before the next action.
     - **'inject_instruction'**: Injects real-time guidance mid-flight when the
-      subagent errs, stalls, or loops. Applied at the start of the next
-      planning turn (Pro) or the next reactive loop (Flash). Requires
+      subagent errs, stalls, or loops. An in-flight model response or read-only
+      helper is cancelled immediately, then the runner observes the device again
+      and consumes the new guidance. An already-started device action finishes
+      safely before the runner changes direction. Requires
       `instruction` (unless `release_loop=True`). To end a continuous
       monitoring task ([Loop:continuous] milestone) gracefully, you MUST pass
       `release_loop=True` — this is the only signal that unlocks the
@@ -697,7 +699,7 @@ def mobile_manage_task(
             return {
                 "trace_id": trace_id,
                 "status": current_status,
-                "message": f"Successfully injected instruction{suffix}: '{instruction}'",
+                "message": f"Guidance accepted and current model step interrupted{suffix}; check guidance_history for consumption.",
             }
         except Exception as e:
             return {