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/play/data-safety.ts

@@ -13,11 +13,12 @@ import { dataSafetyCsv, dataSafetyProblem, dataSafetyRows } from '../lib/data-sa
 import { DATA_SAFETY_UPLOADED } from '../lib/declarations';
 import { done, log } from '../lib/log';
 import { playClient } from './client';
+import * as rt from '../lib/rt';
 
 export const DATA_SAFETY_HASH = '.storebound/data-safety.sha256';
 
 /** sha256 of the CSV for one package. Pure. */
-export const dataSafetyHash = (pkg: string, csv: string): string => new Bun.CryptoHasher('sha256').update(`${pkg}\n${csv}`).digest('hex');
+export const dataSafetyHash = (pkg: string, csv: string): string => rt.hasher('sha256').update(`${pkg}\n${csv}`).digest('hex');
 
 /** The hash of the last upload of this package, null when none is recorded. */
 export function lastUpload(root: string, pkg: string): { sha256: string; at: string } | null {