rm-hull / thrust / 24007137805

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Rudimentary main game loop (experiment) (#2)

* feat: implement initial game loop and render logic

- Move sprite initialization to `gamedata` package to centralize
  asset loading.
- Introduce `GameLoopScene` to manage player movement, terrain
  rendering, and object placement.
- Refactor `Sprite` struct to decouple from screen bounds.
- Update `main` to bypass terminal scenes for active gameplay
  prototyping.

* feat: implement camera centering and intro sequence

- Centered the camera on the player using `screen` dimensions.
- Refactored `DrawObject` into the `Draw` loop for better coordinate
  handling.
- Enabled the intro splash screen and terminal text.
- Updated initial game level selection.

```mermaid
sequenceDiagram
    participant Camera
    participant Terrain
    participant LevelObjects

    Camera->>Terrain: Offset by screen center
    Camera->>LevelObjects: Translate relative to player
    Note over LevelObjects: Loop draws all active objects
```

* feat: add gravity and tune movement physics

- Add `Gravity` field to `Sprite` struct to enable vertical
  acceleration.
- Adjust `MoveForward` parameters and thrust intensity for
  better control.
- Update default game level to 2.

```mermaid
sequenceDiagram
    participant S as Sprite
    participant U as Update()
    U->>S: Apply Gravity to Velocity.Y
    U->>S: Add Velocity to Position
```

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