PASS: documented install URL live (public-cdn.cloud.unity3d.com, HTTP 200)
PASS: unity CLI installs via documented script
PASS: unity --version = 1.0.0-beta.10, exactly the version SKILL.md documents (1.0.0-beta.10)
PASS: bare unity prints usage and exits 0 (SKILL.md claim verified)
PASS: unknown flag exits 2 per documented exit-code table
PASS: auth status returns documented JSON envelope, loggedIn false, no credentials
PASS: doctor returns structured checks array (binary-on-path, path-duplicates, ...)
PASS: editors --installed returns documented envelope with empty data
PASS: unity skill install --list enumerates supported agent clients

Run C summary: 9 passed, 0 failed (of 9)