Release v0.68.0

What's Changed

• Changelog for v0.67.0-preview.0 by @gemini-cli-robot in #29990
• Changelog for v0.66.0 by @gemini-cli-robot in #29992
• docs(readme): clarify Gemini CLI scope, limitations, and tool landscape by @LyalinDotCom in #29995
• fix(cli): bound inline history re-render after terminal width changes by @jvargassanchez-dot in #29904
• fix(ui): handle surrogate pairs when truncating in sanitizeForDisplay by @diegogodinezr in #29993
• fix(core): make isWithinRoot case-insensitive on Windows by @duvanka-prasad in #29999
• fix(core): recognize dotted Gemini 3 models in supportsMultimodalFunctionResponse by @jesussamuel-byte in #29982
• feat(cli): add extension validation command and evaluation tests by @tadipavan in #29980
• fix(core): normalize leading slashes in file search query for @ autocomplete by @urielefrenvirtusa in #29987
• fix(vscode-ide-companion): register all extension disposables in context.subscriptions by @jvargassanchez-dot in #29994
• fix(core): list Auto in /model when dynamicModelConfiguration is enabled and preview access is disabled by @villahernandez-coder in #29998
• fix(core,cli): fix instances of incorrect \n escape behavior by @ugorla-dev in #29989
• fix(core): use PowerShell CIM fallback for Windows IDE process lookup by @tadipavan in #30006
• fix(cli): surface 429 rate limit cool-down and countdown in loading indicator by @urielefrenvirtusa in #30012
• fix(cli): anchor .git suffix removal to end of repo URL by @diegogodinezr in #30013
• fix(ci,sdk): run SDK tests in PR CI and fix AgentLoopContext mock in session.test.ts by @duvanka-prasad in #30023
• fix(core): prevent $-pattern corruption in LLM prompt templates by @duvanka-prasad in #30035
• fix(cli): Fixes unexpected truncation and toggle behavior in Expandab… by @tadipavan in #29965
• refactor(cli): decouple ToolGroupMessage from internal type guards and payload structures by @ugorla-dev in #30041
• fix(core): gate background log stream initialization on execution lifecycle transition by @jesussamuel-byte in #30031
• fix(core): honor .git/info/exclude and core.excludesFile in shadow repo by @urielefrenvirtusa in #30034
• fix(core): flush pending SSE event buffer at stream EOF in CodeAssistServer by @tadipavan in #30050
• fix(core): handle Windows libuv zero-device stat reporting in readSecureFileBuffer by @jvargassanchez-dot in #30044
• fix(cli): serialize concurrent extension installs with per-extension lock (#29036) by @diegogodinezr in #30039
• fix(core): resolve symlinked paths canonically in GlobTool by @ugorla-dev in #30042
• fix(cli): add missing active and focus keys to custom theme ui schema by @villahernandez-coder in #30032
• fix(core,cli): preserve selected model across transient fallback, cancel, and rewind by @villahernandez-coder in #30059
• fix(core): prevent interrupted Whisper model downloads from being treated as installed by @tadipavan in #30058
• fix(cli): handle stream failures during extension release downloads by @duvanka-prasad in #30100
• fix(core): preserve explicit gemini-2.5-flash model in dynamic model resolution by @jesussamuel-byte in #30057
• fix(hooks): support SubagentStop event mapping and merge hook definitions by @diegogodinezr in #30111
• fix(cli): await history replay before responding to ACP session/load by @tadipavan in #30112
• fix(sandbox): supply --userns=keep-id for rootless podman by @diegogodinezr in #30118

Full Changelog: v0.67.0...v0.68.0