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Johannes Plunien
4ae1659a0c
Slimming a simulator cost a boot, one `launchctl` spawn per label, and a reboot to apply them — 2m14s for the default 170-label profile. A device that is already shut down does not need any of that: launchd_sim is a host process, and it reads its disable overrides at startup from a per-device host directory keyed only by UDID, next to the device's launchd.log. Writing them there before the boot makes the simulator come up slim the first time. Measured on an iPhone 17 Pro / iOS 26.5: a first slim goes from 2m14s to 33s, nearly all of it the boot itself, and `on --preserve-boot-state` from a cold device takes 15s. `verify` reports 170/170 and 78 daemons remain, matching a simulator slimmed the old way. The path is an undocumented CoreSimulator detail, so it is best-effort rather than trusted. Writes merge, leaving both the runtime's own explicit-enable entries and any unmanaged label untouched. The booted device is always read back with `print-disabled`, and an unwritable store or a runtime that ignores it falls back to the `launchctl` path instead of failing or reporting a slim simulator that isn't one.