Python: Fix RUN_FINISHED.interrupt to accumulate all interrupts when multiple tools need approval (#4717)

* Fix flow.interrupts overwrite when multiple tools need approval (#4590)

Change flow.interrupts assignment to append so that all interrupt entries
accumulate when multiple tools require approval in a single turn.

Both _run_common.py and _agent_run.py used assignment (=) which caused
each new interrupt to overwrite the previous one. Switching to append()
ensures RUN_FINISHED.interrupt contains all pending approvals.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add test for streaming path with multiple confirm_changes interrupts (#4590)

Add integration test exercising run_agent_stream with multiple predictive
tool calls requiring confirmation. Verifies that flow.interrupts.append()
correctly accumulates all interrupt entries and they appear in the
RUN_FINISHED event.

Also confirms FlowState already declares interrupts field with
default_factory=list, addressing the AttributeError concern from review.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Apply pre-commit auto-fixes

---------

Co-authored-by: Copilot <copilot@github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

python/packages/ag-ui/agent_framework_ag_ui/_agent_run.py

@@ -1015,7 +1015,7 @@ async def run_agent_stream(
                         flow.tool_calls_by_id[confirm_id] = confirm_entry
                         flow.tool_calls_ended.add(confirm_id)  # Mark as ended since we emit End event
                         flow.waiting_for_approval = True
-                        flow.interrupts = [
+                        flow.interrupts.append(
                             {
                                 "id": str(confirm_id),
                                 "value": {
@@ -1027,7 +1027,7 @@ async def run_agent_stream(
                                     },
                                 },
                             }
-                        ]
+                        )
 
     # Close any open message
     if flow.message_id:

python/packages/ag-ui/agent_framework_ag_ui/_run_common.py

@@ -320,7 +320,7 @@ def _emit_approval_request(
     )
     interrupt_id = func_call_id or content.id
     if interrupt_id:
-        flow.interrupts = [
+        flow.interrupts.append(
             {
                 "id": str(interrupt_id),
                 "value": {
@@ -332,7 +332,7 @@ def _emit_approval_request(
                     },
                 },
             }
-        ]
+        )
 
     if require_confirmation:
         confirm_id = generate_event_id()