chore(main): release 0.6.0

[adk-java-releases-bot]

🤖 I have created a release beep boop

0.6.0 (2026-07-10)

Features

• add callbackContextData to InvocationContext (723c814)
• core: migrate from the Java Gen AI SDK to the Kotlin Gen AI SDK (067dae1)
• round-trip GenerateContentConfig labels and support routingConfig (d65becd)
• serialization: expose the shared kotlinx Json instance and Any<->JsonElement helpers (91419ad)

Bug Fixes

• align Ktor and kotlinx-coroutines with the GenAI SDK's Ktor 2.x (c94daef)
• Fixed the resolveScopedArtifactDir function where jvm (in windows) ignoring path which start with '/' as absolute path. (3a773ed)
• generate function-call ids and re-attach thought signatures in the streaming aggregator (007bc4c)
• pin published kotlin-stdlib to 2.1 for Kotlin 2.1 consumer compatibility (7342e3d)
• seed AgentTool child session from parent session state (64f79e6)

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