Fix swapped transport method calls in SessionService

[Copilot]

The addExpectedResponse and removeExpectedResponse methods in SessionService were delegating to opposite transport methods, breaking the rate-limiter's expected-response accounting.

Changes:

• Fixed addExpectedResponse to call transport.addExpectedResponse (was calling removeExpectedResponse)
• Fixed removeExpectedResponse to call transport.removeExpectedResponse (was calling addExpectedResponse)

Impact:
Without this fix, sending requests would decrement the expected-response counter and completing requests would increment it, causing legitimate responses to be rate-limited and the counter to grow unbounded.

// Before (incorrect)
private addExpectedResponse(socketAddr: Multiaddr): void {
  this.transport.removeExpectedResponse?.(multiaddrToObject(socketAddr).host);
}

// After (correct)
private addExpectedResponse(socketAddr: Multiaddr): void {
  this.transport.addExpectedResponse?.(multiaddrToObject(socketAddr).host);
}

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