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Clear the remaining compiler warnings suggest: squiggle_bounds never used its fallback cohort (neither does the C++ it was ported from), the final-cohort path advanced a `pos` nothing reads after it, `reading_lines` was never written, and `trace_removed_readings` was never written or read — run_cg re-emits stream blocks verbatim instead of rebuilding them from Cohort, so the trace lines C++ collected per cohort come through as text blocks. ts: the schema-aware type string was computed and dropped; `returns` is a runtime type tag and the schema travels in its own field. ast: the streaming path's multiple-input arm is still a todo!(), so say what is missing when it fires. playground: get_active_tab/_mut had no callers; tabs are found by id.