v0.64.0

## What's Changed
* refactor(a2a-server): implement V1 to V2 settings migration logic by @jvargassanchez-dot in https://github.com/google-gemini/gemini-cli/pull/29450
* fix(acp): bridge PromptResponse.usage and emit usage_update notifications (#29389) by @elberthc-byte in https://github.com/google-gemini/gemini-cli/pull/29549
* Changelog for v0.63.0-preview.0 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/29565
* fix(cli): propagate resolved folder trust state in headless mode (#29031) by @amelidev in https://github.com/google-gemini/gemini-cli/pull/29528
* chore(release): bump version to 0.64.0-nightly.20260929.gd75234cae by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/29567
* fix(cli): prevent CPU hang and quote swallowing on @ within code (#29434) by @elberthc-byte in https://github.com/google-gemini/gemini-cli/pull/29557
* fix(core): serialize file tool operations and make writes atomic (#29078) by @elberthc-byte in https://github.com/google-gemini/gemini-cli/pull/29499
* fix(core): implement append-only delta patching and bounded history windowing in ChatRecordingService by @jvargassanchez-dot in https://github.com/google-gemini/gemini-cli/pull/29568
* fix(cli): persist state atomically and recover from backup on corruption by @urielefrenvirtusa in https://github.com/google-gemini/gemini-cli/pull/29558
* fix(cli): ensure Ctrl+C emergency abort reaches cancellation handler during active operations by @urielefrenvirtusa in https://github.com/google-gemini/gemini-cli/pull/29586
* fix(cli): resolve @file:line references and prevent ghost text wrap hang by @jesussamuel-byte in https://github.com/google-gemini/gemini-cli/pull/29581
* fix(ui): ensure Windows ConPTY forwards IME cursor position by @jesussamuel-byte in https://github.com/google-gemini/gemini-cli/pull/29560
* fix(cli): retry directory removal on Windows locking errors during extension updates by @jesussamuel-byte in https://github.com/google-gemini/gemini-cli/pull/29540
* fix(acp): resolve session by exact id and handle listener cleanup on session failure by @diegogodinezr in https://github.com/google-gemini/gemini-cli/pull/29580
* fix(cli): preserve scroll position and partition pending height budget by @luisfelipe-alt in https://github.com/google-gemini/gemini-cli/pull/29520
* fix(cli): ensure Enter and Spacebar reliably confirm selection list options by @ugorla-dev in https://github.com/google-gemini/gemini-cli/pull/29502
* fix(patch): cherry-pick 2ce1a69 to release/v0.64.0-preview.0-pr-29672 to patch version v0.64.0-preview.0 and create version 0.64.0-preview.1 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/29696


**Full Changelog**: https://github.com/google-gemini/gemini-cli/compare/v0.63.0...v0.64.0