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doc: world_state, world_state_reusing, state_in_frame_at, state_in_frame, face_point_state, face_point_names and construction_state return Result. A body that could not be placed, a frame that could not be inverted, a sketch plane or thread axis that did not survive the placement, or a failed placing worker used to leave things where they were without a word; now the call fails with what could not be placed. is_placement is the one test of an occurrence's placement (finite, a rotation that does not mirror, a translation within 1e9 mm). Opening a design names every occurrence that fails it; add_occurrence refuses one; a joint solution that would place an occurrence outside one is not applied and the joints placing it report it. engine: Session::world_state returns Result and keeps a failure in its cache as it keeps a placed model. bounds, home_camera, open_sketch_plane, the scene builders, the world previews, frames::to_local and auto_operation pass the error on; helpers answering "not found" take the placed model from their caller. Commands setting a placement check it (valid_position, exploded view, fastener at a point, STEP insert matrix). ui: panels, picks and hovers read the session's placed model through open_meshing::session_world; a model that cannot be placed shows no placed bodies, and the viewport says why across its bottom. Pictures and the control channel report the error. cli, mcp: snapshots, renders, benches and the oracle report the error; the kernel-case rig records it as the case's failure. Tests read the new Results with unwrap. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt