Release v0.63.0

What's Changed

• fix(cli): display retry progress indicator during connection recovery (#28340) by @amelidev in #29468
• Changelog for v0.61.0-preview.1 by @gemini-cli-robot in #29469
• Changelog for v0.61.0 by @gemini-cli-robot in #29472
• fix(cli): distinguish missing MCP enablement config from malformed JSON by @jesussamuel-byte in #29446
• fix(cli): restore paused stdin after capability detection by @ugorla-dev in #29487
• fix(core): bound tool output size and optimize memory lifecycle in long-running agent loops by @diegogodinezr in #29451
• fix(core): remove invalid diff.external override by @urielefrenvirtusa in #29467
• chore(release): bump version to 0.63.0-nightly.20260923.gf50ba8608 by @gemini-cli-robot in #29471
• Changelog for v0.62.0-preview.0 by @gemini-cli-robot in #29470
• fix(core): clean up temporary directory when background shell execution exits by @jesussamuel-byte in #29437
• fix(acp): resolve session before config initialization and avoid same-minute filename collisions by @jesussamuel-byte in #29463
• fix(core): align policy redirection gates, path validation, and workflow parsing by @DavidAPierce in #29506
• fix(auth): prevent infinite auth loop from file contention, headless keyring, and supervisor state drops (#28341) by @villahernandez-coder in #29448
• fix(core): enable autonomous plan execution in non-interactive mode by @urielefrenvirtusa in #29539
• fix(core): disable truncation when maxChars <= 0 in formatTruncatedToolOutput by @diegogodinezr in #29542

Full Changelog: v0.62.0...v0.63.0