Changelog for v0.29.0 (#19361)

Co-authored-by: g-samroberts <158088236+g-samroberts@users.noreply.github.com>

docs/changelogs/index.md

@@ -18,7 +18,26 @@ on GitHub.
 | [Preview](preview.md) | Experimental features ready for early feedback. |
 | [Stable](latest.md)   | Stable, recommended for general use.            |
 
-## Announcements: v0.28.0 - 2026-02-03
+## Announcements: v0.29.0 - 2026-02-17
+
+- **Plan Mode:** A new comprehensive planning capability with `/plan`,
+  `enter_plan_mode` tool, and dedicated documentation
+  ([#17698](https://github.com/google-gemini/gemini-cli/pull/17698) by @Adib234,
+  [#18324](https://github.com/google-gemini/gemini-cli/pull/18324) by @jerop).
+- **Gemini 3 Default:** We've removed the preview flag and enabled Gemini 3 by
+  default for all users
+  ([#18414](https://github.com/google-gemini/gemini-cli/pull/18414) by
+  @sehoon38).
+- **Extension Exploration:** New UI and settings to explore and manage
+  extensions more easily
+  ([#18686](https://github.com/google-gemini/gemini-cli/pull/18686) by
+  @sripasg).
+- **Admin Control:** Administrators can now allowlist specific MCP server
+  configurations
+  ([#18311](https://github.com/google-gemini/gemini-cli/pull/18311) by
+  @skeshive).
+
+## Announcements: v0.28.0 - 2026-02-10
 
 - **Slash Command:** We've added a new `/prompt-suggest` slash command to help
   you generate prompt suggestions