Add Base44 dev environment

.base44/environment.json

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+{
+  "previewPort": 3000,
+  "healthPath": "/",
+  "startCommand": "docker compose -f docker-compose.base44.yml up -d",
+  "secrets": [],
+  "verifiedAtCommit": "0f056184cab70e27f6343afb6d0d67f546e63f9d"
+}

AGENTS.md

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+# jst — Base44 dev notes
+
+## What this is
+A Cargo workspace (`crates/cli`, `crates/server`, `crates/shared`) plus a static
+Vite-served website in `docs/` (marketing page + in-browser WASM shell demo).
+The browser demo proxies its `/api/jst-demo` and `/api/jst-status` calls to the
+already-hosted production server at `https://jst-server.fly.dev`, so the
+frontend renders and is explorable without running the Rust server or any
+external credentials.
+
+## Running in the Base44 sandbox
+`docker-compose.base44.yml` runs a single `node:22` service that bind-mounts
+the repo, runs `npm install`, and starts the Vite dev server serving `docs/`
+on port 3000.
+
+- `vite.config.js` dev server is configured with `host: true`, `port: 3000`,
+  and `allowedHosts: true` so the preview proxy hostname is accepted.
+- `npm ci` fails because `package-lock.json` is out of sync; use `npm install`.
+- Prebuilt demo bundles already live in `docs/assets/` (committed), so no
+  `npm run build:demo` is needed to view the site.
+
+## Verification
+- `curl -sf -H "Host: external-preview.example.com" http://localhost:3000/`
+  returns the page (HTTP 200) with `<title>jst — shell commands from plain English</title>`.
+- `script.js`, `styles.css`, and the `/assets/*.js` demo bundles are served.
+
+## When credentials are needed
+The Rust server (`crates/server`) needs `LLM_API_URL` / `LLM_API_KEY` /
+`LLM_MODEL` (and optionally `DEMO_LLM_API_KEY` for the browser demo endpoint)
+only if you self-host the proxy. The frontend sandbox does **not** require any
+secrets in this dev setup because it talks to the hosted fly.dev server.

docker-compose.base44.yml

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+services:
+  web:
+    image: node:22
+    working_dir: /app
+    command: sh -c "npm install && npx vite docs --config vite.config.js --base / --host 0.0.0.0 --port 3000"
+    environment:
+      - NODE_ENV=development
+    volumes:
+      - .:/app
+      - /app/node_modules
+    ports:
+      - "3000:3000"
+    restart: unless-stopped