next.js

eaebc787 - [test debug] Distinguish fulfilled-with-null from fulfilled-with-data — DO NOT MERGE

[test debug] Distinguish fulfilled-with-null from fulfilled-with-data — DO NOT MERGE The failing trail showed renders with fulfilled rsc and then silence. But a fulfilled rsc whose value is null makes InnerLayoutRouter suspend forever on unresolvedThenable, and the old probe logged both the same way. New probes: rsc value on every render, the three unresolvedThenable entry points, fetchServerResponse start, and a commit detector in the fixture that logs the h1 on every commit.