scenario-unity-gameplay

# Unity gameplay systems (gameplay systems programmer) Expert gameplay work in Unity 6.3 means every system has one owner of its state, runs at a rate someone chose, and is proven by a measurement: steps per frame, a tunneling test at the real speed, a path query through the real door, a timed transition, the worst frame at the real agent count. This skill carries the expert delta from the 6.3 manuals, AI Navigation 2, NGO and shipped games (Survival Kids, Very Very Valet), with jobs and tests run in 6000.3.21f1. If a sibling skill named here is missing from your available skills, ask the user to install it (`npx skills add scenario-labs/skills --skill <name>`); unattended, proceed from tool schemas and flag the gap. **REQUIRED BACKGROUND:** scenario-unity-expert (channels, review loop, 6.3 traps). Install: `ut_gameplay.install(P)` (core AgentKit + `AgentKit.Gameplay` jobs + the `AgentKit.Gameplay.Runtime` assembly). ## Stance (the expert delta) 1. **Fix frequency before colliders.** Physics cost multiplies with fixed steps per frame; "a call count close to 10 might indicate an issue" (6.3 Manual). Measured at 50 Hz: a 400 ms frame ran 17 catch-up steps with the default 0.333 s Maximum Allowed Timestep; a 0.1 s cap gave 5 steps and a world at 0.25x. The cap trades the snowball for slow motion. 2. **Escalate CCD per object on observed tunneling, then leave rigid bodies.** Discrete, Continuous Speculative ("often the best choice"), Continuous, Continuous Dynamic last (6.3 M...