release dart_mcp 0.3.0 (#216)

diff --git a/pkgs/dart_mcp/CHANGELOG.md b/pkgs/dart_mcp/CHANGELOG.md
index 59240c6..9847e7d 100644
--- a/pkgs/dart_mcp/CHANGELOG.md
+++ b/pkgs/dart_mcp/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 0.3.0-wip
+## 0.3.0
 
 - Added error checking to required fields of all `Request` subclasses so that
   they will throw helpful errors when accessed and not set.
diff --git a/pkgs/dart_mcp/pubspec.yaml b/pkgs/dart_mcp/pubspec.yaml
index 0e48b2a..e315cb9 100644
--- a/pkgs/dart_mcp/pubspec.yaml
+++ b/pkgs/dart_mcp/pubspec.yaml
@@ -1,5 +1,5 @@
 name: dart_mcp
-version: 0.3.0-wip
+version: 0.3.0
 description: A package for making MCP servers and clients.
 repository: https://github.com/dart-lang/ai/tree/main/pkgs/dart_mcp
 issue_tracker: https://github.com/dart-lang/ai/issues?q=is%3Aissue+is%3Aopen+label%3Apackage%3Adart_mcp