chore: drop dead context compat, retire plan boxes, fix spec wording

src/wf_core/runtime/ops/frames.py

@@ -18,29 +18,6 @@ from wf_core.errors import WorkflowExecutionError
 from wf_core.run_state import ExecutionFrame, ForeachContext, RunState
 
 
-def frame_context_values(frame: ExecutionFrame) -> dict[str, object | None]:
-    context: dict[str, object | None] = {
-        PRIOR_OUTCOME_CONTEXT_KEY: frame.prior_outcome,
-        ACTIVATED_INCOMING_EDGE_CONTEXT_KEY: frame.activated_incoming_edge,
-        SCOPE_ID_CONTEXT_KEY: frame.scope_id,
-        LINEAGE_ID_CONTEXT_KEY: frame.lineage_id,
-        PARENT_LINEAGE_ID_CONTEXT_KEY: frame.parent_lineage_id,
-    }
-    if frame.kind == "foreach_iteration":
-        loop_item = frame.metadata.get("loop_item")
-        loop_index = frame.metadata.get("loop_index")
-        loop_alias = frame.metadata.get("loop_alias")
-        context[LOOP_ITEM_CONTEXT_KEY] = loop_item
-        context[LOOP_INDEX_CONTEXT_KEY] = loop_index
-        if (
-            isinstance(loop_alias, str)
-            and loop_alias
-            and loop_alias not in RESERVED_CONTEXT_KEYS
-        ):
-            context[loop_alias] = loop_item
-    return context
-
-
 @dataclass(frozen=True, slots=True)
 class FrameContextView:
     """Typed handler context and graph values from one ancestry walk."""