[hdcodedev]

Summary

• Document chart data requirements and validation behavior.
• Clarify selection lifecycle, style properties, palettes, gradients, and range handling.
• Correct KDoc links and subtitle parameter documentation.

Local Validation

• ./gradlew ktlintCheck
• ./gradlew :charts-<module>:jvmTest
• ./gradlew chartsTestJvm
• ./gradlew ciCompile
• ./gradlew chartsCheck
• ./gradlew apiCompatibilityCheck
• ../charts-playground/gradlew -p ../charts-playground -DchartsLocalPath="$PWD" ciCompile
• ./gradlew :androidApp:validateDebugScreenshotTest
• ./gradlew updateScreenshots

git diff --check and git diff --cached --check passed.
./gradlew ktlintCheck passed.
./gradlew apiCompatibilityCheck was attempted before full access was enabled and blocked by sandbox permissions. It was not rerun locally. Other local Gradle checks were skipped.

All changes are KDoc comments. Runtime behavior and rendered output are unchanged.