fixup(d1-base): dedupe InMemoryTransport export; adapt C5 compat test to A1 concrete Protocol

Author: felixweinberger

packages/core/src/exports/public/index.ts

@@ -79,9 +79,6 @@ export { deserializeMessage, ReadBuffer, serializeMessage } from '../../shared/s
 export type { FetchLike, Transport, TransportSendOptions } from '../../shared/transport.js';
 export { createFetchWithInit } from '../../shared/transport.js';
 
-// In-memory transport (for testing client/server in the same process)
-export { InMemoryTransport } from '../../util/inMemory.js';
-
 // URI Template
 export type { Variables } from '../../shared/uriTemplate.js';
 export { UriTemplate } from '../../shared/uriTemplate.js';

packages/core/test/shared/protocol.compat.test.ts

@@ -7,16 +7,8 @@ import type { Transport } from '../../src/shared/transport.js';
 import type { JSONRPCMessage } from '../../src/types/index.js';
 import { _resetDeprecationWarnings } from '../../src/util/deprecate.js';
 
-class TestProtocolImpl extends Protocol<BaseContext> {
-    protected assertCapabilityForMethod(): void {}
-    protected assertNotificationCapability(): void {}
-    protected assertRequestHandlerCapability(): void {}
-    protected assertTaskCapability(): void {}
-    protected assertTaskHandlerCapability(): void {}
-    protected buildContext(ctx: BaseContext): BaseContext {
-        return ctx;
-    }
-}
+// Protocol is concrete in v2; alias keeps the rest of the test unchanged.
+const TestProtocolImpl = Protocol;
 
 class MockTransport implements Transport {
     onclose?: () => void;
@@ -31,7 +23,7 @@ class MockTransport implements Transport {
 }
 
 describe('v1-compat: flat ctx.* getters', () => {
-    let protocol: Protocol<BaseContext>;
+    let protocol: Protocol;
     let transport: MockTransport;
     let warnSpy: ReturnType<typeof vi.spyOn>;