Orrery: game loop, name generator and derelict dungeons

An ASCII sci-fi-fantasy game for the terminal, built on ratatui.

- Game loop with a fixed 30 Hz tick and a stack of scenes; the kitty
  keyboard protocol is turned on where the terminal supports it, so later
  real-time scenes can tell when a key is held.
- Stable hierarchical seeds: the whole universe derives from one u64,
  with tests pinning the exact outputs so old seeds keep working.
- Name generator with four cultures, each with its own syllables and
  templates, plus unidentified/true names for artifacts.
- Title screen with an animated orrery, and a name forge for browsing
  generated names.
- Derelict ships to board: ship-shaped maps with an engine room, spine
  corridor, side rooms and bridge; symmetric shadowcasting sight;
  monsters that wake on sight and hunt; loot carried out through the
  airlock goes into the hold.
- `orrery names` and `orrery ship` print the generators' output without
  the TUI, for tuning.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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