Unity performance (performance engineer)

Expert performance work is a measurement discipline: a budget in milliseconds, the bounding thread named before any change, the biggest measured cost fixed first, structure before tuning, and every fix proven with before/after numbers from a development player. An agent does all of it headless: AgentProfile in Editor Play mode to iterate, PerfProbe in a batch-mode player for verdicts, PerfCapture to attribute costs from a Profiler capture, metal_trace for GPU time, PerfBuild for size. Target: Unity 6000.3.21f1, URP 17.3, macOS Apple Silicon. 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, ut_* toolkit).

Stance (the expert delta)