ci: add Spotless/detekt quality gate and a Linux test leg

[jamesarich]

Closes #3.

Wires the two standard quality gaps into the build + CI in one PR.

B — Spotless (ktlint) + detekt (§7.1 / §7.2)

• Spotless com.diffplug.spotless 8.8.0 with ktlint 1.8.0 over src/**/*.kt and the Gradle build scripts. ktlint reads .editorconfig, so that file stays the single source of Kotlin style.
• detekt 1.23.8, buildUponDefaultConfig = true, with a small config/detekt/detekt.yml. KMP has no main/test source sets, so detekt is pointed at the src/ tree directly.
• spotlessApply was run and the reformatting committed before the check was wired (the .editorconfig/ktlint lesson) — pure ktlint whitespace/wrapping churn across the codec, no behavior change.
• Pre-existing findings in the RFC 8878 engine (lifted verbatim from TAKPacket-SDK) are captured in config/detekt/baseline.xml (11 issues) so the gate blocks new issues while the engine is cleaned up incrementally.
• Per-file .editorconfig override turns max-line-length off for the Base64/hex fixtures in TestVectors.kt.

Verified locally on JDK 21: ./gradlew spotlessCheck detekt → BUILD SUCCESSFUL.

D — Linux test leg (§4.2 / §5.1)

• New ubuntu-latest job that actually executes the JVM/JS/Wasm/linuxX64 tests (jvmTest jsTest wasmJsTest wasmWasiTest linuxX64Test) plus spotlessCheck detekt apiCheck. Today's single macos-latest runner cross-compiles the linuxX64 test binary but never runs it — this closes that gap.
• The existing macos-latest job is kept unchanged for the Apple/native targets (it is the required status check — not renamed/removed).
• Reuses the repo's SHA-pinned action refs (no mutable tags); caches ~/.konan for linuxX64Test.

New CI job name

Quality gate & Linux tests (JVM/JS/Wasm/linuxX64) — consider adding it to the branch-protection ruleset as a required status check alongside the existing Build, test & API check (all KMP targets).

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📥 Commits

Reviewing files that changed from the base of the PR and between 9cbb68d and e8f9b53.

📒 Files selected for processing (19)

• .editorconfig
• .github/workflows/ci.yml
• CONTRIBUTING.md
• build.gradle.kts
• config/detekt/baseline.xml
• config/detekt/detekt.yml
• gradle/libs.versions.toml
• src/commonMain/kotlin/org/meshtastic/kzstd/Zstd.kt
• src/commonMain/kotlin/org/meshtastic/kzstd/ZstdDictionary.kt
• src/commonMain/kotlin/org/meshtastic/kzstd/internal/BitReader.kt
• src/commonMain/kotlin/org/meshtastic/kzstd/internal/Fse.kt
• src/commonMain/kotlin/org/meshtastic/kzstd/internal/Huffman.kt
• src/commonMain/kotlin/org/meshtastic/kzstd/internal/MatchIndex.kt
• src/commonMain/kotlin/org/meshtastic/kzstd/internal/OutputBuffer.kt
• src/commonMain/kotlin/org/meshtastic/kzstd/internal/ParsedDictionary.kt
• src/commonMain/kotlin/org/meshtastic/kzstd/internal/ZstdDecoder.kt
• src/commonMain/kotlin/org/meshtastic/kzstd/internal/ZstdEncoder.kt
• src/commonTest/kotlin/org/meshtastic/kzstd/TestVectors.kt
• src/jvmTest/kotlin/org/meshtastic/kzstd/KzstdLibzstdInteropTest.kt

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