feat: salvage Angular developer skill

skills/angular-developer/references/show-routes-with-outlets.md

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+# Show Routes with Outlets
+
+The `RouterOutlet` directive is a placeholder where Angular renders the component for the current URL.
+
+## Basic Usage
+
+Include `<router-outlet />` in your template. Angular inserts the routed component as a sibling immediately following the outlet.
+
+```html
+<app-header /> <router-outlet />
+<!-- Route content appears here -->
+<app-footer />
+```
+
+## Nested Outlets
+
+Child routes require their own `<router-outlet />` within the parent component's template.
+
+```ts
+// Parent component template
+<h1>Settings</h1>
+<router-outlet /> <!-- Child components like Profile or Security render here -->
+```
+
+## Named Outlets (Secondary Routes)
+
+Pages can have multiple outlets. Assign a `name` to an outlet to target it specifically. The default name is `'primary'`.
+
+```html
+<router-outlet />
+<!-- Primary -->
+<router-outlet name="sidebar" />
+<!-- Secondary -->
+```
+
+Define the `outlet` in the route config:
+
+```ts
+{
+  path: 'chat',
+  component: Chat,
+  outlet: 'sidebar'
+}
+```
+
+## Outlet Lifecycle Events
+
+`RouterOutlet` emits events when components are changed:
+
+- `activate`: New component instantiated.
+- `deactivate`: Component destroyed.
+- `attach` / `detach`: Used with `RouteReuseStrategy`.
+
+```html
+<router-outlet (activate)="onActivate($event)" />
+```
+
+## Passing Data via `routerOutletData`
+
+You can pass contextual data to the routed component using the `routerOutletData` input. The component accesses this via the `ROUTER_OUTLET_DATA` injection token as a signal.
+
+```ts
+// In Parent
+<router-outlet [routerOutletData]="{ theme: 'dark' }" />
+
+// In Routed Component
+outletData = inject(ROUTER_OUTLET_DATA) as Signal<{ theme: string }>;
+```