feat(js): m09 input, app, runtime, browser, main, index.html and smoke test

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

js/src/app.js

@@ -0,0 +1,26 @@
+import { todo } from './todo.js'
+import { pure } from './io.js'
+
+/** Milliseconds between game steps. */
+export const TICK_MS = 150
+
+/**
+ * Stream of everything that can happen to the game: `Action.Tick` every TICK_MS (from `interval`),
+ * merged with the `Action` for each key press that `keyToAction` recognises (from `keyDowns`).
+ */
+export const classicActions = { step: () => todo('m09') }
+
+/**
+ * Fold a stream of actions into a stream of game states: start from `newGame(seed)`, apply `update` to each action
+ * (scan), and emit the initial state first (startWith) so there is something to draw before anything happens.
+ */
+export const states = (seed, actions) => todo('m09')
+
+/** The drawing of one state, as an IO: `drawScene(view(state))`. */
+export const render = (state) => todo('m09')
+
+/**
+ * The whole program as a value, `IO<Stream<IO<unit>>>`: ask for a random seed, then turn the stream of
+ * states (built from `classicActions`) into a stream of drawings (`render`). Nothing runs here.
+ */
+export const main = pure({ step: () => todo('m09') })