fix: API 문서 생성과 릴리스 검증 수정

.github/workflows/release.yml

@@ -70,6 +70,7 @@ jobs:
         with:
           name: api-docs
           path: library/build/dokka/html/
+          if-no-files-found: error
 
       - name: Upload coverage report
         uses: actions/upload-artifact@v6

AGENTS.md

@@ -118,7 +118,7 @@ git push origin v<version>
 
 - **JaCoCo**: 코드 커버리지 측정 (`./gradlew :library:jacocoTestReport`) + 임계값 검증 80% (`./gradlew :library:jacocoCoverageVerification`)
 - **Android Lint**: 정적 분석 (`./gradlew :library:lint`)
-- **Dokka 2.0**: API 문서 생성 (`./gradlew :library:dokkaGenerate`)
+- **Dokka 2.2**: AGP 9 내장 Kotlin 소스셋 기반 API 문서 생성 (`./gradlew :library:dokkaGenerate`)
 - **ProGuard Consumer Rules**: `library/consumer-rules.pro`에 public API 보호 규칙과 패키지 범위 Compose keep 규칙 정의
 - **성능 벤치마크**: `GridBenchmarkTest.kt`에서 대량 데이터(1000~3650일) 성능 검증
 - **Compose Compiler Reports**: 필요 시 `-PcomposeCompilerReports=true`로 metrics/reports 생성

CHANGELOG.md

@@ -7,6 +7,9 @@
 
 ## [Unreleased]
 
+### Fixed
+- Dokka 2.2.0으로 업그레이드해 AGP 9 내장 Kotlin 소스셋을 문서화하고, API 문서 artifact 누락 시 Release 워크플로가 실패하도록 검증 강화
+
 ## [1.2.0] - 2026-07-15
 
 ### Added

gradle/libs.versions.toml

@@ -9,7 +9,7 @@ activityCompose = "1.8.0"
 kotlin = "2.0.21"
 composeBom = "2024.09.00"
 mavenPublish = "0.30.0"
-dokka = "2.0.0"
+dokka = "2.2.0"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
@@ -34,4 +34,3 @@ android-library = { id = "com.android.library", version.ref = "agp" }
 kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
 maven-publish = { id = "com.vanniktech.maven.publish", version.ref = "mavenPublish" }
 dokka = { id = "org.jetbrains.dokka", version.ref = "dokka" }
-

library/src/main/java/com/inseong/gitgrass/GitGrassComponents.kt

@@ -345,7 +345,7 @@ internal fun StreakSummary(
 /**
  * Color legend showing "Less ↔ More" with gradient cells.
  *
- * Displays: [lessLabel] [empty] [level1] [level2] ... [levelN] [moreLabel]
+ * Displays [lessLabel], the empty color, each level from low to high, and [moreLabel].
  */
 @Composable
 internal fun ColorLegend(