fix(runtime): isolate nested invocation ownership

src/agent_runtime/completion.py

@@ -181,8 +181,9 @@ def with_completion_gate(func):
         trusted_workspace = vet_workspace(bound.get('workspace')) if bound.get('workspace') else ''
         requirements = replace(requirements, workspace_root=trusted_workspace or '')
         parent = current_journal()
-        journal = parent if parent is not None and parent.workspace == requirements.workspace_root else ActionJournal(
-            workspace=requirements.workspace_root, observed_artifacts=requirements.required_artifacts)
+        journal = ActionJournal(
+            workspace=requirements.workspace_root, observed_artifacts=requirements.required_artifacts,
+            parent_run_id=bound.get('_parent_run_id') or (parent.run_id if parent is not None else None))
         answer_events: list[dict] = []
         metrics_events: list[dict] = []
         answer = ''
@@ -308,7 +309,8 @@ def with_completion_gate(func):
             for event in metrics_events:
                 metadata = event.setdefault('data', {})
                 metadata.update(completion_decision=decision.to_dict(), evidence_events=ledger.to_list(),
-                                action_receipts=journal.to_list(), completion_requirements=requirements.to_dict())
+                                action_receipts=journal.to_list(), completion_requirements=requirements.to_dict(),
+                                run_id=journal.run_id, parent_run_id=journal.parent_run_id)
                 metadata['completion_gate'] = {
                     'buffer_seconds': released_at - first_answer_at if first_answer_at is not None else 0,
                     'first_visible_answer_seconds': released_at - started,

src/agent_runtime/journal.py

@@ -66,6 +66,7 @@ class ActionJournal:
     actions: list[ActionReceipt] = field(default_factory=list)
     workspace: str = ''
     observed_artifacts: tuple[str, ...] = ()
+    parent_run_id: str | None = None
 
     def capture_versions(self, action: ActionReceipt) -> None:
         if self.workspace:
@@ -111,9 +112,11 @@ _ACTION: ContextVar[ActionReceipt | None] = ContextVar('runtime_current_action',
 @contextmanager
 def bind_journal(journal: ActionJournal):
     token = _JOURNAL.set(journal)
+    action_token = _ACTION.set(None)
     try:
         yield journal
     finally:
+        _ACTION.reset(action_token)
         _JOURNAL.reset(token)