Get a scenario's COMPACT state: its computed_status, inputs, estimate and price.

Returns a compact record, never the raw ~50 KB detail: scenario_id, computed_status, mesh_triangle_count_estimate and its _breakdown, latest_run_is_valid, the latest run's run_id, run_status, error_message, user_message, status_detail and mesh_triangle_count — plus what the scenario IS and what it will cost: name, description, project, resolution, duration, the input row ids (terrain, boundary, friction, inflow, rainfall, building, mesh_region), compute_cost_estimate (USD), vcpu_hours_estimate, and inflow_anchor_mismatch (null unless an inflow series starts after the model does, whose first value is then held backwards).

The computed_status field (there is NO status key on a scenario) is derived from the latest run and will be one of: created, building, built, queued, computing, processing, complete, error, or cancelled — created also means no run exists yet. A scenario must be built before it can be run. latest_run_is_valid is false after any edit since the last build. A non-member reading a public project's scenario gets a reduced record: the fields the server withholds (the input ids, the price, inflow_anchor_mismatch) are ABSENT here rather than reported as null — "withheld" is not "no terrain, no cost" — while the run-state keys, computed_status among them, read null.

No presigned S3 URL is returned by any read tool (each is a 6-hour capability): results stay viewable through a run's gn_layer_* WMS entries — use get_run for the full run record.