fix(smollm2): drop unused linuxX64/linuxArm64 targets - #313

Summary

Root cause of the failed 0.40.1 Maven Central publish
(workflow run):
:llm-inference:smollm2 declares linuxX64()/linuxArm64() Kotlin/Native targets, but
the module has zero source outside jvmMain (SmolLm2ExportCli.kt,
SmolLm2ExportHarness.kt — no commonMain at all). compileKotlinLinuxArm64 reports
NO-SOURCE and produces no .klib, but vanniktech.mavenPublish still registers a
publication for that target, and generateMetadataFileForLinuxArm64Publication
unconditionally tries to hash the (nonexistent) klib file — FileNotFoundException,
build aborts.

This killed the tag-triggered ./gradlew publish release workflow partway through —
several other modules (llm-api, llm-agent, llm-core, transformer-core,
llm-inference:{apertus,bert,functiongemma,gemma,llama,moonshine,qwen}, llm-bom,
llm-performance, llm-providers, and smollm2's own JVM publication) had already
published successfully by the time it hit this task; several others
(llm-inference:{t5,vec2text,voxtral,whisper}, all of llm-runtime:*) never got
attempted. 0.40.1 is being superseded by 0.40.2 to recover.

Fix

Drop the two unused target declarations — matches what the module actually has source
for. Audited every other multiplatform module in the repo for the same
declared-target-vs-actual-source mismatch (grepped declared targets against src/
subdirectories, spot-checked file counts in commonMain for each); smollm2 was unique,
everything else that declares native targets has real commonMain/nativeMain source
backing them.

Verification

• ./gradlew :llm-inference:smollm2:assemble :llm-inference:smollm2:compileTestKotlinJvm — passes
• ./gradlew :llm-inference:smollm2:generateMetadataFileForKotlinMultiplatformPublication :llm-inference:smollm2:generateMetadataFileForJvmPublication — passes (no linuxArm64/linuxX64 metadata tasks exist anymore)
• Checked for other modules depending on smollm2's Linux artifacts specifically — none (llm-runtime:iree-android only references it in a doc comment)

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