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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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src/app/shared/models/star.model.ts

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+/**
+ * A single star from the HYG (Hipparcos/Yale/Gliese) catalog, positioned relative to the
+ * Sun in the galaxy-scale coordinate system (parsecs). The same positions are also packed
+ * into a compact binary buffer (`stars.bin`, in index order) for fast bulk rendering; this
+ * record format (`stars-index.json`) is used for search, labels, and lookups by id/name.
+ */
+export interface StarRecord {
+  id: number;
+  name: string;
+  x: number;
+  y: number;
+  z: number;
+  magnitude: number;
+  spectralType: string;
+  colorIndex: number;
+}
+
+/** HYG id used for the Sun itself, so solar-system bodies can reference their host star. */
+export const SUN_STAR_ID = 0;