Stop a background extra's action reaching narration

build_scene already dropped an unassigned detection from `characters` and
`present`, so an extra never reached the cast list. Its ACTION did. `actions` was
built from every detection, and that list is what the script prompt renders and
what the verifier uses as evidence, so "standing at the window" arrived as a fact
about the panel with no character attached and the verifier confirmed it, because
the action really was in the blob.

Skip has_face is False, the same gate and the same fail-open semantics as
enrollment. Self-check covers all three cases: a real cast member's action
survives, a faceless one's does not, and a detection from a panel where the
detector never ran keeps its action.

decisions/identity-bbox.md#extras-gate-consumers

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

worker_scene.py

@@ -91,7 +91,13 @@ def build_scene(data: SceneInput):
     vchars = data.vision_result.get("characters", [])
     # `actions` is the list the orchestrator's beat builder reads for verifier evidence; `action` is the
     # joined string the script prompt renders. Emitting only the string left verification blind.
-    actions = [c["action"].strip() for c in vchars if str(c.get("action") or "").strip()]
+    # `characters` above already drops an unassigned detection, but its ACTION used to survive, so a
+    # background extra standing at a window became a sentence the narrator read out. A detection with no
+    # detected face is an extra, a figure on a poster, or scenery gemma called a person
+    # (`decisions/identity-bbox.md#face-gates-enrollment`). Gate on `is False`, like the enrollment gate,
+    # so a blob written before the gate existed and a panel whose detector failed both behave as before.
+    actions = [c["action"].strip() for c in vchars
+               if str(c.get("action") or "").strip() and c.get("has_face") is not False]
     action = "; ".join(actions)
     return {"panel_id": data.panel_id, "characters": characters, "dialogue": dialogue,
             "action": action, "actions": actions,
@@ -132,6 +138,20 @@ if __name__ == "__main__":
                               "description": '{"hair":"black","features":["glasses"]}'}],
     ))
     assert outu["characters"][0]["name"] == "" and outu["characters"][0]["label"] == "the one with black hair and glasses"
+    # a faceless detection's ACTION never reaches the script prompt or the verifier's evidence, but a
+    # real cast member's does, and so does one on a panel where the detector never ran (no key).
+    p7 = build_scene(SceneInput(
+        panel_id="p007",
+        vision_result={"characters": [
+            {"local_id": "person_1", "action": "reading a report", "has_face": True},
+            {"local_id": "person_2", "action": "standing at the window", "has_face": False},
+            {"local_id": "person_3", "action": "pointing"},
+        ]},
+        identity_assignments=[{"local_id": "person_1", "character_id": "c1"}],
+        characters_registry=[{"character_id": "c1", "name": "Seonho"}],
+    ))
+    assert p7["actions"] == ["reading a report", "pointing"], p7["actions"]
+    assert "window" not in p7["action"], p7["action"]
     assert _describe({}) == ""     # bare appearance -> empty, script falls back to Person X
     # animals are named as their species (color + species), never by clothing/"the one with..."
     assert _describe({"species": "cat", "hair": "black"}) == "the black cat"