v15.4.0-canary.6

Core Changes

• [errors] fix edge server initial error is not sent via hmr: #78415
• misc: use correct capitals for React terms: #78445
• Skip empty prefetch request for dynamic routes: #78436

Misc Changes

• Update Turbopack production test manifest: #78441
• Turbopack: Use single write to loader ipc socket: #78423
• Update Turbopack development test manifest: #78442
• test: flake debugging - avoid logs being eaten by jest: #78449
• test: ignore streaming metadata in toBeEmpty assertions: #78456

Credits

Huge thanks to @timneutkens, @lubieowoce, @huozhi, @devjiwonchoi, and @acdlite for helping!