Summary

Closes #665.

Moves the core HloGenerator.generate(model, sampleInput, functionName) workflow out of jvmMain and into commonMain, making StableHLO export available to all KMP targets (jvm, ios, linux, macos). The tracing → ComputeGraph → StableHLO MLIR pipeline has no JVM-specific dependencies, so it now lives in common code.

Changes

• commonMain: HloGenerator.kt (core suspend generate(...) API) moved here from jvmMain.
• jvmMain: new HloGeneratorJvm.kt keeps the JVM conveniences — generateBlocking(...) blocking wrapper (extension + JvmHloGenerator Java facade) and the internal ModelDescriptor overload used by the CLI. HloGeneratorMain.kt CLI unchanged.
• commonTest: new HloGeneratorCommonTest.kt validates the platform-neutral export path (traces a square model, asserts emitted stablehlo.multiply + function/tensor types).
• build.gradle.kts: skainet-lang-models promoted to commonMain; coroutines-test added to commonTest.
• .api: regenerated for the relocated symbols.

Acceptance criteria (#665)

• Core suspend HLO generation API available from commonMain
• JVM CLI and blocking wrappers remain functional
• No JVM-only dependencies leak into common code (all native/ios targets compile)
• Existing regression tests continue passing
• New common test validates the platform-neutral generator path

Verification

./gradlew :skainet-compile:skainet-compile-hlo:jvmTest :skainet-compile:skainet-compile-hlo:apiCheck → BUILD SUCCESSFUL (compiles for jvm + iosArm64 + iosSimulatorArm64 + macosArm64 + linuxX64 + linuxArm64).

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