feat(bundle): ship dsh-base, dsh-web-app, and dsh-headless profile bundles

Profile bundles are npm packages declaring dsh.patch in their manifest:
dsh-base carries the former base.cordis.yml rows as one insert over the empty
profile root; dsh-web-app carries the web overlay plus a runtime glue plugin
owning what used to be launcher code (frontend dist resolution via
frontend-static, the web-surface prompt section, bash runtime variables, the
readiness-gated URL line); dsh-headless carries the one-shot runner driving a
task turn through the in-process API carrier under the launcher-provided
ctx.headlessIo seam.

packages/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/README.md
-README.md: 4832fffbc8963b8a7b1f8332e691083195bf94bc
-README.zh.md: 076b4f877070fcf0ee6b98d2310d1121cbbe63d6
+README.md: dec4d71ca2d323fe05f918dd3bf4709cfa01878e
+README.zh.md: 9596dfe8bf8d2d6144ffe7820886342707dd3009