## Why

The existing `@suaveplan/geo` package only covers Earth-surface geometry and mixes abstract math with Earth-specific constants. Neither the existing `@suaveplan/day-night` nor `@suaveplan/geo` is enterprise-grade, extensible to other planets, or observatory-accurate. This change introduces a seven-package astronomical core that provides real astronomical calculations, generalised planet-surface geometry, and a pluggable provider architecture.

## What Changes

- **Restructure `@suaveplan/geo`** — abstract math extracted into new `@suaveplan/geo`; Earth-specific logic migrates to new `@suaveplan/geo-earth`.
- **Create `@suaveplan/geo-planet`** — configurable `PlanetConfig` and `PlanetSurface` for any planet's ellipsoid, atmosphere, and satellites.
- **Create `@suaveplan/universe`** — observer-centric astronomical core: coordinate frames, provider interfaces (`SolarProvider`, `StarProvider`, `TidalProvider`, `WeatherProvider`), `UniverseClient` plugin registry, and BitSchema wire protocols for star/body data.
- **Create `@suaveplan/solar-system`** — `SolarProvider` implementation using astronomy.js for real bodies plus Keplerian propagator for game-defined planets.
- **Create `@suaveplan/stars`** — `StarProvider` with bundled BSC5 catalog (~9k stars, bitpacked), swappable catalog source architecture, and deferred interfaces for Hipparcos/Tycho-2/Gaia.
- **Rewrite `@suaveplan/tides`** — enterprise-grade tidal prediction preserving TICON/ADMIRALTY Earth providers, adding physics-based multi-satellite model for any planet, `TidalProvider` adapter for `universe`, and full OTel/AbortSignal/Zod coverage.
**BREAKING**: `@suaveplan/geo` public API is preserved but internal implementation changes; consumers should verify no dependency on internal file paths.

## Capabilities

### New Capabilities

- `geo`: Abstract spherical and ellipsoidal geometry — pure math with no planet-specific constants.
- `geo-planet`: Configurable planet surface geometry from `PlanetConfig` — ellipsoid, atmosphere, satellites, and orbital elements.
- `geo-earth`: Earth pre-configuration of `geo-planet` — WGS84, Moon, ISA atmosphere, plus geocoding, geohash, and coordinate formatting.
- `universe`: Astronomical observer model — `ObserverPosition`, `CoordinateFrame`, provider interfaces, `UniverseClient` plugin registry, and BitSchema wire protocols.
- `solar-system`: Solar system computation — real body positions via astronomy.js, Keplerian propagator for custom planets, seasons, equinoxes, solstices, lunar phases, eclipses.
- `stars`: Star catalog provider — BSC5 bundled source, swappable catalog architecture, atmospheric extinction, and deferred SurrealDB/Hipparcos/Tycho-2/Gaia interfaces.
- `tides`: Tidal prediction — Earth harmonic providers (TICON, ADMIRALTY) and physics-based multi-satellite model for any planet.

### Modified Capabilities

- None.

## Impact

- **New packages**: 7 packages across `universal/geo`, `universal/astronomy`, and `universal/primitives` plugin directories.
- **Dependency graph**: `geo` → `geo-planet` → `geo-earth` → `universe` → (`solar-system`, `stars`, `tides`).
- **Downstream consumers**: Any package depending on `@suaveplan/geo` internals must update to `@suaveplan/geo-planet` abstractions.
- **Follow-up change**: `enterprise-gaming-universe` builds the gaming layer (`gaming-universe`, `gaming-environment-lighting`) on top of this astronomical core.
- **Deferred integrations**: `@suaveplan/weather` (locked interface in `WeatherProvider` but no implementation), SurrealDB star storage, Hipparcos/Tycho-2/Gaia catalog sources, and R3F/Three.js rendering integrations are explicitly out of scope.