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/mcp.ts

@@ -23,6 +23,7 @@
 import pkg from '../package.json' with { type: 'json' };
 import { runCommand, type Running } from './lib/runner';
 import { listTools, TOOLS, toArgv, validateInput } from './mcp-tools';
+import * as rt from './lib/rt';
 
 /** Current (modern, stateless) revision. */
 export const PROTOCOL = '2026-07-28';
@@ -132,7 +133,7 @@ export async function serve(): Promise<void> {
   console.error(`[storebound mcp] ${pkg.version} on stdio (MCP ${PROTOCOL}, legacy ${LEGACY.join(', ')}), project ${process.env.STOREBOUND_PROJECT || process.cwd()}`);
   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;