fix: update stale go-sdk v1.5.0 annotations to v1.6.0 in mcp package

Author: Copilot

internal/mcp/connection.go

@@ -364,7 +364,7 @@ func (c *Connection) reconnectSDKTransport() error {
 			HTTPClient: headerClient,
 			// MaxRetries: -1 disables SDK-level reconnect retries (0 = SDK default 5 retries;
 			// negative = 0 retries). The gateway handles reconnection itself, so we set -1 to
-			// prevent double-retry behaviour. Verified against go-sdk v1.5.0 streamable.go:1547-1552.
+			// prevent double-retry behaviour. Verified against go-sdk v1.6.0 streamable.go:1547-1552.
 			// See TestMaxRetriesSentinelCanary for an automated guard against SDK changes.
 			MaxRetries:           -1,
 			DisableStandaloneSSE: true,

internal/mcp/http_transport.go

@@ -459,7 +459,7 @@ func tryStreamableHTTPTransport(ctx context.Context, cancel context.CancelFunc,
 				HTTPClient: httpClient,
 				// MaxRetries: -1 disables SDK-level reconnect retries (0 = SDK default 5 retries;
 				// negative = 0 retries). We fall through to SSE or plain JSON-RPC on failure.
-				// Verified against go-sdk v1.5.0 streamable.go:1547-1552.
+				// Verified against go-sdk v1.6.0 streamable.go:1547-1552.
 				// See TestMaxRetriesSentinelCanary for an automated guard against SDK changes.
 				MaxRetries: -1,
 				// DisableStandaloneSSE prevents the SDK from issuing a GET request for a

internal/mcp/http_transport_test.go

@@ -1296,7 +1296,7 @@ func TestOIDCRoundTripper_ErrorPropagation(t *testing.T) {
 // gateway's reconnect logic would silently permit extra retries and this test
 // would fail to alert.
 //
-// SDK source: streamable.go:1547-1552 (verified against go-sdk v1.5.0):
+// SDK source: streamable.go:1547-1552 (verified against go-sdk v1.6.0):
 //
 //	maxRetries := t.MaxRetries
 //	if maxRetries == 0 {