For agents, on top of README.md, which they read first.

Notes for agents

• No clock, no drawing, no platform types. Time is an argument; the crate must stay portable to the UniFFI binding.
• Thresholds are first guesses (poke 300 ms and 0.15 travel, spin two turns in 2 s, sleep after 90 s). They are untested on a young child's finger; adjust from the tablet, with a test per change.
• A spin is measured from the cat's middle, ignoring touches within 0.25 of it, where the angle is noise.