feat: expose structured context during execution

src/wf_core/runtime/ops/flow.py

@@ -161,10 +161,22 @@ def _foreach_ancestor_ids(run: RunState, frame: ExecutionFrame) -> list[str]:
 def finalize_run(workflow: Workflow, run: RunState) -> RunState:
     if run.outcome is None:
         run.outcome = "ok"
+    # Root workflow output keeps standard root facts consistent by projecting
+    # against the root frame's derived context rather than an empty mapping.
+    from wf_core.run_state import ROOT_FRAME_ID
+    from wf_core.runtime.ops.frames import frame_context_view
+
+    root_frame = run.frames.get(ROOT_FRAME_ID)
+    root_context: dict[str, Any] = (
+        dict(frame_context_view(run, root_frame).graph)
+        if root_frame is not None
+        else {}
+    )
     run.output = project_output(
         workflow,
         run.state,
         workflow_input=run.workflow_input,
+        context=root_context,
     )
     validate_payload_against_schema(
         workflow.output_schema, run.output, "workflow output"

src/wf_core/runtime/ops/foreach.py

@@ -23,7 +23,7 @@ from wf_core.runtime.lineage import (
     scope_input_for_frame,
 )
 from wf_core.runtime.ops.flow import advance_frame, append_step_result_trace
-from wf_core.runtime.ops.frames import frame_context_values
+from wf_core.runtime.ops.frames import frame_context_view
 from wf_core.runtime.ops.index import WorkflowIndex
 from wf_core.runtime.ops.merges import ReducerDefinition
 from wf_core.runtime.ops.overlays import state_view_for_frame
@@ -174,7 +174,7 @@ def _resolve_foreach_iterable(
         str(step.over),
         state=state_view_for_frame(run, frame),
         workflow_input=scope_input_for_frame(run, frame),
-        context=frame_context_values(frame),
+        context=frame_context_view(run, frame).graph,
     )
     if not isinstance(iterable, list):
         raise WorkflowExecutionError(

src/wf_core/runtime/ops/handlers.py

@@ -14,7 +14,7 @@ from wf_core.run_state import (
 )
 from wf_core.runtime.lineage import scope_input_for_frame
 from wf_core.runtime.ops.flow import append_trace
-from wf_core.runtime.ops.frames import frame_context_values
+from wf_core.runtime.ops.frames import frame_context_view
 from wf_core.runtime.ops.interrupts import build_interrupt_request
 from wf_core.runtime.ops.overlays import state_view_for_frame
 
@@ -75,7 +75,7 @@ def handle_interrupt_step(
         frame_id=frame.id,
         state=state_view_for_frame(run, frame),
         workflow_input=scope_input_for_frame(run, frame),
-        context=frame_context_values(frame),
+        context=dict(frame_context_view(run, frame).graph),
         public_frame_id=public_frame.id,
         public_node_id=public_frame.node_id,
         route=route,

src/wf_core/runtime/ops/nodes.py

@@ -20,7 +20,7 @@ from wf_core.runtime.lineage import (
     commit_foreach_aware_patch,
     scope_input_for_frame,
 )
-from wf_core.runtime.ops.frames import frame_context_values
+from wf_core.runtime.ops.frames import frame_context_view
 from wf_core.runtime.ops.merges import ReducerDefinition
 from wf_core.runtime.ops.overlays import state_view_for_frame
 from wf_core.runtime.ops.schemas import validate_payload_against_schema
@@ -54,7 +54,8 @@ def _resolve_node_execution(
     node_def: NodeDef,
     platform: object | None = None,
 ) -> tuple[dict[str, Any], RuntimeContext, dict[str, Any]]:
-    context_values = frame_context_values(frame)
+    context_view = frame_context_view(run, frame)
+    context_values = context_view.graph
     state_view = state_view_for_frame(run, frame)
     resolved_input = resolve_step_input_bindings(
         node.input,
@@ -76,6 +77,7 @@ def _resolve_node_execution(
         prior_outcome=frame.prior_outcome,
         activated_incoming_edge=frame.activated_incoming_edge,
         metadata=dict(frame.metadata),
+        foreach=dict(context_view.foreach),
         platform=platform,
     )
     return resolved_input, context, state_view

src/wf_core/runtime/subgraphs.py

@@ -18,7 +18,7 @@ from wf_core.run_state import (
 )
 from wf_core.runtime.input_bindings import resolve_step_input_bindings
 from wf_core.runtime.lineage import commit_foreach_aware_patch
-from wf_core.runtime.ops.frames import frame_context_values
+from wf_core.runtime.ops.frames import frame_context_view
 from wf_core.runtime.ops.merges import ReducerDefinition
 from wf_core.runtime.ops.overlays import state_view_for_frame
 from wf_core.runtime.ops.runs import initial_state
@@ -140,7 +140,7 @@ def _start_subgraph(
         step.input,
         state=state_view_for_frame(run, frame),
         workflow_input=parent_scope.workflow_input,
-        context=frame_context_values(frame),
+        context=frame_context_view(run, frame).graph,
         label=f"subgraph {step.id!r}",
     )
     validate_payload_against_schema(
@@ -218,7 +218,7 @@ def _finish_subgraph(
         prepared.workflow,
         child_scope.committed_state,
         workflow_input=child_scope.workflow_input,
-        context=frame_context_values(child_frame),
+        context=frame_context_view(run, child_frame).graph,
     )
     validate_payload_against_schema(
         prepared.workflow.output_schema,

src/wf_core/validation/steps.py

@@ -329,7 +329,12 @@ def validate_foreach_node(
     input_root_fields: set[str],
     workflow: Workflow,
 ) -> None:
-    if not is_valid_source_path(node.over, state_root_fields, input_root_fields):
+    # Interim permissive gate: context-rooted `over` paths reach runtime, where
+    # structured ancestry resolution handles them. Task 5 replaces this with
+    # location-aware validation against the consuming node's context schema.
+    if not is_valid_source_path(
+        node.over, state_root_fields, input_root_fields, allow_context=True
+    ):
         report.add(
             ValidationIssueCode.INVALID_FOREACH_SOURCE,
             f"nodes[{index}].over",