docs: add CLI v0.36.6 changelog entry (#530)

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

Author: factory-ben

docs/changelog/cli-updates.mdx

@@ -4,6 +4,25 @@ description: "Recent features and improvements to Factory CLI"
 rss: true
 ---
 
+<Update label="December 17" rss={{ title: "CLI Updates", description: "Gemini 3 Flash, terminal links, and terminal reliability fixes" }}>
+  `v0.36.6`
+
+  ## New features
+
+  * **Gemini 3 Flash model** - Added support for Gemini 3 Flash
+
+  ## Improvements
+
+  * **Agent readiness signals** - Expanded agent readiness signals in readiness reports
+
+  ## Bug fixes
+
+  * Fixed overly strict filtering by allowing common read-only `git` commands
+  * Fixed copy/paste issues on WSL
+  * Fixed repository deduplication in `/readiness` reports
+
+</Update>
+
 <Update label="December 13" rss={{ title: "CLI Updates", description: "GPT-5.2 model and MCP tool management" }}>
   `v0.36.2`