docs: v2 follow-up improvements

- Add v2 development notice at top of README
- Fix npm badge URLs (add missing %2F encoding)
- Update CONTRIBUTING.md for pnpm/corepack workflow
- Document branch strategy (main vs v1.x)
- Move InMemoryEventStore from server exports to internal (not in public API)

Author: felixweinberger

…elpers/src/helpers/inMemoryEventStore.ts …/server/src/server/inMemoryEventStore.tstest/helpers/src/helpers/inMemoryEventStore.ts renamed to packages/server/src/server/inMemoryEventStore.ts test/helpers/src/helpers/inMemoryEventStore.ts renamed to packages/server/src/server/inMemoryEventStore.ts

@@ -1,9 +1,14 @@
-import type { EventStore, JSONRPCMessage } from '@modelcontextprotocol/server';
+import type { JSONRPCMessage } from '@modelcontextprotocol/core';
+
+import type { EventStore } from './webStandardStreamableHttp.js';
 
 /**
  * Simple in-memory implementation of the EventStore interface for resumability.
  * This is primarily intended for examples and testing, not for production use
  * where a persistent storage solution would be more appropriate.
+ *
+ * NOTE: This is intentionally not exported from the package index.
+ * Import directly from this file if needed for testing.
  */
 export class InMemoryEventStore implements EventStore {
     private events: Map<string, { streamId: string; message: JSONRPCMessage }> = new Map();

test/helpers/src/index.ts

@@ -1,5 +1,4 @@
 export * from './fixtures/zodTestMatrix.js';
 export * from './helpers/http.js';
-export * from './helpers/inMemoryEventStore.js';
 export * from './helpers/oauth.js';
 export * from './helpers/tasks.js';

test/integration/test/taskResumability.test.ts

@@ -8,8 +8,10 @@ import {
     McpServer,
     StreamableHTTPServerTransport
 } from '@modelcontextprotocol/server';
+// Import directly from server internals (not exported from main index)
+import { InMemoryEventStore } from '../../../packages/server/src/server/inMemoryEventStore.js';
 import type { ZodMatrixEntry } from '@modelcontextprotocol/test-helpers';
-import { InMemoryEventStore, listenOnRandomPort, zodTestMatrix } from '@modelcontextprotocol/test-helpers';
+import { listenOnRandomPort, zodTestMatrix } from '@modelcontextprotocol/test-helpers';
 
 describe.each(zodTestMatrix)('$zodVersionLabel', (entry: ZodMatrixEntry) => {
     const { z } = entry;