Core Changes

• docs: agent skills, pr-status script, and AGENTS.md updates (1/8): #89857

Misc Changes

• Upgrade Lightning CSS: #88789
• fix(turbopack): --debug-build-paths fails with route groups: #89336
• docs: clarify async instrumentation register request : #90039
• Add AGENTS.md and bundled docs guide: #89973

Credits

Huge thanks to @mischnic, @devjiwonchoi, @swarnava, @feedthejim, and @gaojude for helping!