bootGame's require("src.core.Game") was resolving to Gen2Compat's Game
facade after a Gold session, so the next Gen 1 boot got an empty proxy
whose rawget(load) is nil (iOS: "src.core.Game missing load after
reload"; Android: Game:load called on a nil value).
Two independent causes, both needed:
* callerIsMod decided "not under src/" meant "a mod", and main.lua is
not under src/, so the engine's own require was gated as a mod's.
Root chunks main.lua and conf.lua are now matched exactly, which a
mod's own mods/<id>/main.lua cannot collide with.
* devShim.generation was only ever set, never cleared, so the
generation Gold declared outlived Gold's session. Loader.endSession
drops it from SessionLifecycle.endMountedSession, and the facade
gate now requires generation == 2 rather than ~= 1.
Only platforms that return to the launcher in-process (Android, and iOS
since #1808) keep the shim alive across sessions; everywhere else the
process restart cleared it.
bryanthaboi