feat(ipod): the generic iPod runtime keeps every game's screen awake

[doodlewind]

What

Evan's decision for Studio games on the iPod touch 4: they keep the screen awake. The generic iPod runtime (bun tools/runtime.ts ipod, #564) now compiles hosts/ios-legacy/runtime.c with POCKET_KEEP_AWAKE, the switch a first-party app's keepAwake descriptor sets: launch_application calls setIdleTimerDisabled:YES for the app's lifetime. The docs table in docs/IPODTOUCH4.md says so; tests/ipodtouch4-profile.test.ts pins the define in the runtime build.

Device results (iPod4,1, iOS 6.1.6 10B500, UDID 68dbced5…, AppSync Unified; ipodtouch4:<udid> lease)

Repack check on main (efb39e90, before this change), runtime build 70f432a0…:

• bun tests/e2e/ipod-repack.ts --manifest twenty48-remix/pocket.json --id dev.pocket-nexus.studio.twenty48-remix --title "Twenty48 Remix" … --device: 2.2 MB .pocket, 1,117,720-byte .ipa repacked in 133 ms; deploy --ipa installed it through AppSync with byte-exact readback of every bundle file, launch reported state=running renderer=gles1 640x960@2, first frame captured; whole run 23.6 s.
• AppSync accepted the bundle signed once for every game: the executable's ad hoc signature (identifier PocketJSRuntime, Info.plist not bound, no sealed resources) under another file name, Info.plist, icons and app.pocket.
• Played with injected HID touches (a scratch IOHIDEventSystemClient helper, not committed): a tap on "Tap to start" started the game (last_touch_hit 39), five swipes slid tiles to score 20; the status record counted 6 completed touch sequences, 60 frames per second window, 0.4 ms guest+core per frame, 2.8 ms present.
• Missing and refused games, on a throwaway bundle id that was uninstalled afterwards: without app.pocket the status record says state=failed error=this app carries no game: app.pocket is missing renderer=software; with a damaged footer, app.pocket is not a ipodtouch4-dev ABI 8 game (error 4). The process stayed alive in both and HOME left it.
• Before this change the game stopped drawing about 58 s after launch (frame 3481): the iPod's auto-lock.

With this change (runtime build c722c410…), the same game installed and launched, then left untouched for 150 s: at 03:21 the status record still advanced (frame 10081, 0 touch sequences) and the capture returned the live frame.

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