Core Changes

• fully remove clientSegmentCache flag: #85541
• [turbopack] Support relative paths in turbopack source maps.: #85146
• Release unnecessary memory on hydration finish: #84967
• Preserve interception markers in parameter types: #85526
• move segment cache entries to top level segment-cache dir: #85542

Misc Changes

• [test]: fix broken scroll restoration test: #85599
• [test] Deflake nested after() tests: #85566
• [test] Stop installing unused dependencies: #85569
• [test] Consider test/integration/ in flake detection tests: #85590
• Turbopack: more checks on verify_serialization: #84952
• Turbopack: add track_caller to improve panics: #85565
• Turbopack: add verify_determinism feature to check if tasks are deterministic: #85559
• docs: cache life rework: #85224
• Turbopack: fix hanging dev server and builds with fs cache: #85606
• Turbopack: Fix compound assignment expression evaluation (#85478): #85593
• Turbopack: fix Scope holding Arc too long: #85611
• [ci] Improve change detection logic in run-for-change script: #85619
• [test] Ignore in deploy tests if a child process isn't available: #85636
• Turbopack: add size_hint and len for Chunk iterator: #85622
• [test]: move resume-data-cache to e2e test: #85647

Credits

Huge thanks to @ztanner, @eps1lon, @lukesandberg, @sokra, @icyJoseph, @hayes, @unstubbable, @shuding, and @wyattjoh for helping!