Gemini CLI v0.63.0

Autonomous Plan Execution: Enabled autonomous plan execution in non-interactive mode to support unattended agent workflows ( #29539 by @urielefrenvirtusa).

Core Stability and Memory Lifecycle: Bounded tool output sizes and optimized memory management in long-running agent loops while preventing infinite authentication loops across headless and supervisor environments ( #29451 by @diegogodinezr, #29448 by @villahernandez-coder).