Angular CLI: 21.0.0-rc.2 Release

@schematics/angular

| Commit | Description | | -- | -- | | | correct tsconfig.spec.json include for spec files |

@angular/cli

| Commit | Description | | -- | -- | | | add schema versioning and metadata to example database | | | promote zoneless migration MCP tool to stable |

@angular/build

| Commit | Description | | -- | -- | | | add webcontainer support for Vitest browser provider | | | correctly handle absolute paths and casing in test discovery | | | do not remove @angular/localize when having external packages (#31721) | | | dynamically select Vitest DOM environment | | | enhance Vitest config merging and validation | | | ensure TestBed setup is robust in non-isolated Vitest | | | show full aggregate errors from vitest | | | simplify SSL handling for ng serve with SSR (#31723) |