PR Checklist

Updates Angular compatibility for @limitless-angular/sanity to include Angular 20.

Closes # N/A

What is the new behavior?

• Expands the Angular peer range for @angular/common, @angular/core, and @angular/router to include Angular 20.
• Updates workspace Angular packages, TypeScript, angular-eslint, ng-packagr, and example app manifests for the Angular 20 toolchain.
• Adds Angular 20 floor/latest compatibility rows and moves the compatibility build target to Angular 20.
• Replaces removed Angular zoneless APIs with provideZonelessChangeDetection / Analog's setupTestBed({ zoneless: true }) test setup.
• Updates @testing-library/angular to v18 and removes no-longer-needed direct dev dependencies such as @angular-devkit/architect and @angular/platform-browser-dynamic from the package manifest.
• Renames the visual editing insert menu output from select to optionSelected to satisfy Angular ESLint 20 output naming rules.

Does this PR introduce a breaking change?

• Yes
• No

Marked as breaking through the Conventional Commit ! indicator and BREAKING CHANGE commit footer. Existing Angular 18 and 19 peer support remains declared, but the workspace build/test toolchain and compatibility build target move to Angular 20.

Other information

Validation run:

• pnpm install
• node --test tools/angular-compat/*.test.mjs
• pnpm run compat:assert
• pnpm run compat:matrix
• pnpm run compat:pack
• pnpm run compat:artifact
• pnpm run compat:test --angular 20
• pnpm run compat:test --set angular-20-floor
• pnpm --filter @limitless-angular/sanity test
• pnpm --filter @limitless-angular/sanity build
• pnpm run test
• pnpm run lint
• pnpm run build

Notes:

• pnpm run lint passes with the repo's existing unused Angular ESLint disable warnings.
• pnpm run build passes with existing CommonJS optimization and Browserslist warnings in the example apps.

[Optional] What gif best describes this PR or how it makes you feel?

N/A