CLI runs on Node 20+: npx storebound (bunx keeps working)

- cli/lib/rt.ts: the runtime layer on node: modules (spawn / spawnSync with Bun's defaults, exit codes and
  "Executable not found", which with PATHEXT, sleep, serve, Glob, hasher, gunzip, stdin, SQLite, packageRoot,
  config imports with a type-stripping fallback for Node 20); every Bun.* use in cli/ goes through it
- tools/gen-embedded.ts -> cli/lib/embedded.ts: templates/, cli/shots/*.html and Play's Data safety form embedded
  (replaces Bun text imports; the bundle and the compiled sidecar carry them), checked fresh by bun run ci
- package.json: bin dist/storebound.mjs (Node ESM bundle, tools/build-node.ts, prepack), engines node >=20
- bun run ci: node bundle + node smoke (real node: --version, help, check same as Bun, scan, release plan --help,
  init, MCP handshake + tool call); Forgejo CI sets up Node 20; tests/node-compat.test.ts guards cli/
- install writes npx MCP commands when run with Node; bin/storebound falls back to Node
- docs: npx storebound init (Node 20+) or bunx storebound init

cli/serve.ts

@@ -27,6 +27,7 @@ import { RENDER_FILE_RE } from './lib/project-files';
 import { androidSdk, detectTools } from './lib/tools';
 import { compiled, pickCallEnv, runCommand, type RunOptions, type Running } from './lib/runner';
 import { inputSchema, type ToolDef, TOOLS, toArgv, validateInput } from './mcp-tools';
+import * as rt from './lib/rt';
 
 type Id = string | number;
 interface Msg { jsonrpc?: string; id?: Id | null; method?: string; params?: unknown }
@@ -388,7 +389,7 @@ export class Session {
     }
     if (!this.guard) throw new RpcError(ERR.notInitialized, 'session.hello first');
     switch (method) {
-      case 'system.version': return { version: pkg.version, compiled: compiled(), platform: process.platform, arch: process.arch, bun: Bun.version };
+      case 'system.version': return { version: pkg.version, compiled: compiled(), platform: process.platform, arch: process.arch, bun: rt.bunVersion, runtime: rt.runtime };
       case 'system.methods': return { methods: describeMethods() };
       case 'system.tools': return localTools();
       case 'project.inspect': return this.inspect(checkProject(params.project), {}, id);
@@ -525,7 +526,7 @@ export async function serveStdio(): Promise<void> {
   console.error(`[storebound serve] ${pkg.version} on stdio (${DESKTOP_PROTOCOL}), waiting for session.hello`);
   let buf = '';
   const decoder = new TextDecoder();
-  const reader = Bun.stdin.stream().getReader();
+  const reader = rt.stdinStream().getReader();
   for (;;) {
     const { value, done } = await reader.read();
     if (done) break;