Fix test suite to properly clean up MCP servers

- Add Accept header to mock requests per MCP spec requirement
- Fix TypeScript build errors in integration tests
- Add shutdownSession calls to properly clean up MCP server intervals
- Update afterEach to ensure proper test cleanup
- Add debug configurations for Jest in VS Code launch.json

All tests now pass without hanging processes.

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

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

src/services/redisTransport.ts

@@ -202,11 +202,12 @@ export class ServerRedisTransport implements Transport {
   }
 }
 
-export async function getShttpTransport(sessionId: string): Promise<StreamableHTTPServerTransport> {
+export async function getShttpTransport(sessionId: string, onsessionclosed: (sessionId: string) => void | Promise<void>): Promise<StreamableHTTPServerTransport> {
   // Giving undefined here and setting the sessionId means the 
   // transport wont try to create a new session.
   const shttpTransport = new StreamableHTTPServerTransport({
     sessionIdGenerator: undefined,
+    onsessionclosed,
   })
   shttpTransport.sessionId = sessionId;