Vendored from github.com/sierra-research/tau-bench @ main, 2026-08-26, by lab admin.
world/db + world.md = their retail mock DB + policy wiki, verbatim.
specimens/*.py.specimen = their tools + test tasks, reference only — never executed here (house law: parked, like the estate runtime).
Our build: acts reimplemented as computed jq transitions in physics; claims conjectured from world.md; scenarios converted from tasks_test.