next.js

a2409549 - [test] Add regression test for segment cache prefetch memory leak (#89756)

[test] Add regression test for segment cache prefetch memory leak (#89756) Follow-up to #89610. Adds an e2e test that detects linear heap growth caused by unclosed prefetch response streams. The test cycles through mounting/unmounting links to trigger repeated prefetches and LRU evictions, then uses CDP heap profiling with linear regression to verify the heap plateaus rather than growing steadily.