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

bin/storebound

@@ -1,4 +1,8 @@
 #!/bin/sh
 # storebound launcher. On PATH while the Claude Code plugin is enabled; or symlink it anywhere.
+# Bun runs the sources; without Bun, Node 20+ runs the npm bundle (dist/storebound.mjs, in the npm package).
 here=$(cd "$(dirname "$0")" && pwd -P)
-exec bun "$here/../cli/index.ts" "$@"
+if command -v bun >/dev/null 2>&1; then exec bun "$here/../cli/index.ts" "$@"; fi
+if [ -f "$here/../dist/storebound.mjs" ] && command -v node >/dev/null 2>&1; then exec node "$here/../dist/storebound.mjs" "$@"; fi
+echo "storebound: needs Bun (https://bun.sh) or Node 20+ with the npm package (npx storebound)" >&2
+exit 127