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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/body.model.ts

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+/**
+ * Osculating Keplerian orbital elements at a reference epoch. Positions are derived
+ * client-side by propagating these elements forward/backward from `epochJd` (see
+ * `shared/astro/kepler.ts`), rather than fetching per-frame positions.
+ */
+export interface OrbitalElements {
+  semiMajorAxisAu: number;
+  eccentricity: number;
+  inclinationDeg: number;
+  longitudeOfAscendingNodeDeg: number;
+  argumentOfPeriapsisDeg: number;
+  meanAnomalyAtEpochDeg: number;
+  epochJd: number;
+}
+
+/**
+ * A solar-system planet, moon, or dwarf planet, sourced from JPL Horizons/SSD orbital
+ * elements. `systemStarId` links back to the HYG star index (the Sun, see `SUN_STAR_ID`).
+ */
+export interface BodyRecord {
+  id: string;
+  systemStarId: number;
+  name: string;
+  kind: 'planet' | 'moon' | 'dwarf';
+  radiusKm: number;
+  orbit: OrbitalElements;
+  /**
+   * For `kind: 'moon'`, the `id` of the planet it orbits — its `orbit` is expressed
+   * relative to that planet, not heliocentrically. Undefined for planets/dwarfs.
+   */
+  parentBodyId?: string;
+}