Add Version Policy to docs

Author: DouweM

docs/changelog.md

@@ -1,7 +1,6 @@
 # Upgrade Guide
 
-In September 2025, Pydantic AI reached V1, which means we're committed to API stability: we will not introduce changes that break your code until V2 (if we do, you can shout at us as it's definitely a mistake).
-Once we release V2, in April 2026 at the earliest, we'll continue to provide security fixes for V1 for another 6 months minimum, so you have time to upgrade your applications.
+In September 2025, Pydantic AI reached V1, which means we're committed to API stability: we will not introduce changes that break your code until V2. For more information, review our [Version Policy](version-policy.md).
 
 ## Breaking Changes
 

mkdocs.yml

@@ -14,7 +14,6 @@ nav:
   - install.md
   - help.md
   - troubleshooting.md
-  - changelog.md
 
   - Documentation:
       - Core Concepts:
@@ -191,6 +190,8 @@ nav:
 
   - Project:
       - contributing.md
+      - changelog.md
+      - version-policy.md
 
 extra:
   # hide the "Made with Material for MkDocs" message
@@ -333,7 +334,6 @@ plugins:
           - install.md
           - help.md
           - troubleshooting.md
-          - changelog.md
         Concepts documentation:
           - a2a.md
           - ag-ui.md
@@ -365,11 +365,15 @@ plugins:
           - durable_execution/*.md
         MCP:
           - mcp/*.md
+        UI Event Streams:
+          - ui/*.md
         Optional:
           - testing.md
           - cli.md
           - logfire.md
           - contributing.md
+          - changelog.md
+          - version-policy.md
         Examples:
           - examples/*.md