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Add star-map Angular app, ETL pipeline, and caveman plugin

Angular 3D star map (galaxy/system/body views, Three.js rendering,
navigation store) plus the NASA ETL tooling that builds the star,
exoplanet and solar-system datasets, Playwright e2e suite, and the
cs:caveman Claude Code plugin (command, agent, skill).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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e2e/camera-flight.spec.ts

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+import { expect, test } from '@playwright/test';
+
+import { backButtonLocator, clickCanvasUntilSystemEntered } from './support/wait-for-back-button';
+
+test.describe('Camera-flight transitions (click-to-select)', () => {
+  test('clicking the star at the view center flies into its system, and the back button flies back out to the galaxy overview', async ({ page }) => {
+    await page.goto('/');
+
+    const canvas = page.getByTestId('scene-canvas');
+    await expect(canvas).toBeVisible();
+    const backButton = backButtonLocator(page);
+    await expect(backButton).toHaveCount(0);
+
+    // Sol sits at the coordinate system's origin, exactly where the default galaxy-view camera
+    // looks, so clicking the canvas center reliably hits it once bootstrap/picking are ready.
+    await clickCanvasUntilSystemEntered(page, canvas, backButton);
+
+    await backButton.click();
+    await expect(backButton).toHaveCount(0, { timeout: 15_000 });
+  });
+});