SpreadsheetBench: SkillOpt mode=multi — 30-turn code repair with execution feedback, 600 s task budget, training-only gold cell feedback

SpreadsheetBench: actor prompts aligned verbatim with the SkillOpt codegen harness

Argument descriptions carry format only; environment description is the single home of world rules

fix: prevent stalled SpreadsheetBench sessions

feat: expose native typed action tools

Preserve official SpreadsheetBench grading positions

Stage isolated SpreadsheetBench concurrency candidate

Isolate runner identities and cap BLAS threads

Freeze public SpreadsheetBench task identities

Remove generated bytecode from Space

Deploy standalone SpreadsheetBench OpenEnv