ElBridge.java: Android Java companion to el_android.c — all public methods are
static, dispatches View mutations to the UI thread via runOnUiThread/CountDownLatch,
and exposes native callbacks (nativeOnClick, nativeOnChange, nativeOnSubmit).
PLATFORM_BRIDGE_SPEC.md: authoritative spec for implementing new platform bridges
(slot table contract, required __* functions, callback dispatch pattern).
detect-platforms: shell script that probes for available bridge toolchains and
prints what can be built on the current machine.
new-platform: scaffold generator that creates a new el_<name>.c with all 33
required stubs wired up.
