- Add `front` block to game.json: depth-11 clouds above the ship (parallax > 1) that drift past the player, creating a "flying through" feel vs. the back layer at depth 3
- Implement `shiftHue` in Color.js to derive the front accent from the system's base atmosphere color (hue rotation + lightness lift), making every nebula a stable two-tone gas
- Refactor NebulaAtmosphere into a data-driven layer array with per-layer depth/tint/parallax/drift; extract `spawnCloud` helper; scale swirl speed by configurable drift
- Add 21 new test checks covering accent math (hue delta, identity, white/black preservation, all 8 palette shades) and two-layer structure (depths, tints, parallax ranges, wrapping, destroy, revert path)
- Stub `Phaser.Math.Between`/`FloatBetween` in phaser-stub for Node tests
- Update PROJECT_NOTES.md to document the two-layer model, accent derivation, and new tuning knobs
Brian Fertig
84909d6f80