Fix what the product-owner pass found in the README, and log an unmergeable receipt (#94)

* Log an unmergeable receipt and correct the README where it overclaims

* Name decodeMessage's arguments and pin the hook's keepalive and unbind

* Let the test name carry what its comment restated

test/readme.test.ts

@@ -335,7 +335,7 @@ describe('README: Errors', () => {
 				return;
 			}
 
-			log.error('the session failed', { message: err.message });
+			log.error('a session failure or lost traffic', { message: err.message });
 		});
 
 		const reported = once<Error>(resolve => { session.on('sessionError', resolve); });