audit: fix concurrent subgraph loss, fail-closed ownership, drop barrier compat

src/wf_core/runtime/lineage.py

@@ -7,7 +7,6 @@ from typing import Any
 
 from wf_core.errors import WorkflowExecutionError
 from wf_core.run_state import ExecutionFrame, LineageState, RunState, StateWrite
-from wf_core.runtime.foreach_state import item_frame_owner, load_foreach_activation
 from wf_core.runtime.ops.state import (
     StatePatch,
     commit_state_patch,
@@ -57,31 +56,7 @@ def lineage_writes_for_frame(
                 run, scope_id=frame.scope_id, lineage_id=frame.lineage_id
             )
         )
-
-    # Compatibility fallback: concurrent foreach used barrier-local patches
-    # before `RunState.lineages` became the primary write store. Keep reading
-    # those patches so old serialized runs and direct barrier tests still work.
-    # Barrier lookup includes the activation so a stale visit cannot read a
-    # later activation's buffered writes.
-    owner = item_frame_owner(frame)
-    if owner is None:
-        return ()
-    parent_frame = run.frames.get(owner.parent_frame_id)
-    if parent_frame is None:
-        raise WorkflowExecutionError(
-            "foreach lineage compatibility state references missing parent frame "
-            f"{owner.parent_frame_id!r} for child frame {frame.id!r}"
-        )
-    activation = load_foreach_activation(
-        parent_frame, owner.foreach_node_id, owner.activation_id
-    )
-    if activation is None or activation.barrier.mode != "concurrent":
-        return ()
-
-    pending = activation.barrier.pending_results.get(owner.item_index)
-    if pending is None:
-        return ()
-    return pending.patch.writes
+    return ()
 
 
 def is_scope_root_lineage_frame(run: RunState, frame: ExecutionFrame) -> bool: