Make McpbManifest point to v0.2 for backwards compatibility

- Change McpbManifest type to point to v0.2 schema instead of McpbManifestAny
- Add DEFAULT_MANIFEST_VERSION export to browser.ts
- Update test fixtures to use manifest_version "0.2" when using McpbManifest type
- Keep @deprecated annotation directing users to McpbManifestAny for multi-version support

This maintains backwards compatibility for existing code using McpbManifest while encouraging new code to use McpbManifestAny for broader version support.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: joan-anthropic

src/browser.ts

@@ -1,4 +1,5 @@
 // Browser-compatible exports
 export * from "./schemas/index.js";
 export * from "./shared/config.js";
+export * from "./shared/constants.js";
 export * from "./types.js";

src/types.ts

@@ -1,6 +1,7 @@
 import type * as z from "zod";
 
 import type { McpbManifestSchema as McpbManifestSchemaAny } from "./schemas/any.js";
+import type { McpbManifestSchema as McpbManifestSchemaV0_2 } from "./schemas/0.2.js";
 import type {
   McpbManifestAuthorSchema,
   McpbManifestCompatibilitySchema,
@@ -52,9 +53,10 @@ export type McpbUserConfigValues = z.infer<typeof McpbUserConfigValuesSchema>;
 export type McpbManifestAny = z.infer<typeof McpbManifestSchemaAny>;
 
 /**
+ * McpbManifest type for v0.2 (default version) for backwards compatibility
  * @deprecated Use McpbManifestAny instead to support all manifest versions.
  */
-export type McpbManifest = McpbManifestAny;
+export type McpbManifest = z.infer<typeof McpbManifestSchemaV0_2>;
 
 /**
  * Information about a MCPB package signature

test/config.test.ts

@@ -90,7 +90,7 @@ describe("getMcpConfigForManifest", () => {
   };
 
   const baseManifest: McpbManifest = {
-    manifest_version: "0.3",
+    manifest_version: "0.2",
     name: "test-extension",
     version: "1.0.0",
     description: "Test extension",
@@ -305,7 +305,7 @@ describe("getMcpConfigForManifest", () => {
 
 describe("hasRequiredConfigMissing", () => {
   const baseManifest: McpbManifest = {
-    manifest_version: "0.3",
+    manifest_version: "0.2",
     name: "test-extension",
     version: "1.0.0",
     description: "Test extension",