Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Phase-A.5 test-lib for lib-core.actor. Covers create-validation (missing/zero movement_speed loud-errors + valid spec), position (initial x/y), move ((0,0) no-op + additive delta), movement_speed. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>