feat(game): add neon isometric relay interface

2026-07-28 09:18:02 +08:00
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+# VANTA//RELAY
+
+A neon isometric puzzle game about being your own infrastructure.
+
+The vault will not accept the current you as a power source. Walk onto a lower-case signal node, **anchor** a frozen echo, then use the reset present-self to cross the matching upper-case gate. Each chamber asks you to sustain more impossible versions of yourself at once.
+
+## Play
+
+This project is fully static and has no package installation or build step.
+
+```sh
+cd /root/vanta-relay-20260727-095415
+python3 -m http.server 4173
+```
+
+Then open `http://127.0.0.1:4173`.
+
+- `WASD` or arrow keys: move
+- `Space`: anchor an echo while standing on a lower-case node
+- `Z`: remove the most recently anchored echo
+- `R`: reset the current relay
+- `M`: toggle synthesized audio
+- `H`: show the protocol card
+
+The on-screen D-pad and buttons provide touch/click alternatives.
+
+## Design
+
+- **Three authored chambers** — from one echo to three simultaneous signal witnesses.
+- **Actual game rules, separate from rendering** — `game-engine.js` is a deterministic, DOM-free state model.
+- **Pseudo-3D canvas world** — an isometric grid, extruded null-walls, glowing gates, particles, animated portal rings, and procedural starfield; no images, fonts, CDN, or network runtime calls.
+- **Accessible controls** — semantic buttons, canvas label, visible objective/status readouts, and keyboard controls.
+- **Optional local progress** — the highest unlocked chamber is stored locally only when browser storage is available.
+
+## Verify
+
+Node 22+ is sufficient; there are no dependencies to install.
+
+```sh
+npm test
+npm run check
+```
+
+The suite covers engine behavior, invalid maps, closed-gate negative paths, echo capacity/undo/reset, authored-map reachability, staged gates, and a static zero-external-asset shell check.
+
+## Project map
+
+```text
+index.html       interface, responsive chrome, and inline style system
+app.js           canvas renderer, controls, particles, audio, smoke-test surface
+game-engine.js   deterministic relay state machine
+levels.js        authored chambers plus graph reachability helper
+tests/           Node test suite
+```
+
+No credentials are stored in this repository.