ci: run :ondeviceai + :coachapi tests in CI (js/wasm/desktop/iosSim)

[ber4444]

Context

The :ondeviceai and :coachapi KMP modules both declare `js(IR)` and `iosSimulatorArm64` targets (the JS targets exist so the React Native port can consume the published artifacts). But no CI job invoked their `check` or `iosSimulatorArm64Test` tasks — they were built for publish only, so their tests ran nowhere. Only `:chess-core`'s JS/iOS tests ran in CI (via `chess-core:check` / the apple job).

A JS-specific or iOS-specific regression in either module would land green.

Change

Two surgical additions to existing Gradle invocations in `.github/workflows/android-tests.yml`:

• Linux job — added `:ondeviceai:check :coachapi:check` to the build command. This pulls in their `jsNodeTest`, `wasmJsBrowserTest`, `desktopTest`, and androidHost test variants (same surface `chess-core:check` already covers for the core).
• Apple job (`apple-kotlin`) — added `:ondeviceai:iosSimulatorArm64Test :coachapi:iosSimulatorArm64Test` to the `--parallel` invocation. Both read `-PiosSimulatorDeviceId` (`ondeviceai` explicitly at `onDeviceAi/build.gradle.kts:96`; `coachapi` via KGP default, same as `chess-core`), so they reuse the existing `iPhone 16` simulator the job already provisions.

No new setup needed — the wasmJs browser tests use the same Chrome the ubuntu runner already provides for `chess-core:check`/`app:check`, and the iOS tasks reuse the existing simulator.

Validation

• `./gradlew :ondeviceai:jsNodeTest :coachapi:jsNodeTest` → `BUILD SUCCESSFUL` (15 tasks executed)
• Dry-run confirmed `:jsNodeTest` resolves for all three modules in a combined invocation
• Dry-run confirmed both `iosSimulatorArm64Test` tasks resolve with `-PiosSimulatorDeviceId="iPhone 16"`

Coverage after this PR

Module	Linux (`check`)	Apple (`iosSimulatorArm64Test`)
`:chess-core`	js, wasmJs, desktop, androidHost	desktop
`:ondeviceai`	js, wasmJs, desktop, androidHost ✨	iosSim ✨
`:coachapi`	js, wasmJs, desktop, androidHost ✨	iosSim ✨
`:app`	wasmJs, desktop, androidHost	iosSim, desktop

✨ = new coverage added by this PR.

Note: the Apple job does not run `chess-core:iosSimulatorArm64Test` — that's a pre-existing gap (the core's iOS tests run via `desktopTest` only there), untouched by this PR.