- New `js/utils/Decode.js` with a pure `ScrambleDecode` class plus
`DECODE_CHARS`, `DECODE_DURATION`, and a per-line `decodeDur()` helper,
so one effect serves both scenes.
- MenuScene now delegates its seed scramble to the shared utility instead
of inlining the reveal math and alphabet.
- GameScene's system dossier types itself in on arrival: each line starts
empty and decodes left-to-right, staggered top-to-bottom, with the
timeline anchored on the first update frame; state self-clears once all
lines settle so `update()` pays nothing afterward.
- Add Node dev tests for the shared effect contract (`dev/decode.test.mjs`)
and for the real GameScene dossier decode against actual galaxy/report
data with a stubbed scene (`dev/system-hud.test.mjs`).
- Document both new test commands in the README and update the planets
PSD asset.
