chore(release/v1-candidate): release 1.38.0

[adk-bot]

🤖 I have created a release beep boop

1.38.0 (2026-08-07)

Features

• live: forward safety_settings from generate_content_config to the Live API (#6641) (99c1aa3)

Bug Fixes

• avoid shell execution in ReadFileTool ranged reads and keep local environment file access in workspace (#6597) (c680728)
• deps: exclude nltk 3.10.1, which breaks venvs living inside the working directory (v1) (#6607) (f25bb90)
• eval: handle failed inference results without invocations (cherry-pick) (#6565) (4555273)
• live: transfer to the target agent regardless of function response order (#6608) (302885b)
• Port tool confirmation security and re-validation fixes to v1 (#6575) (4783364)

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