fix(host): address ds-review-bot v7 on the adaptive picker chooser

- resolve.ts: gate the display branch on linux (the native backend drives
  exactly darwin/win32/linux) and require a zenity/kdialog binary on PATH,
  probed once at boot (new probe.ts, injected predicate for tests); type
  bindHost as the webserver schema's closed union.
- index.ts: the disposer now joins the removed entry's fiber teardown so
  unloading the chooser settles only after the backend quiesced; export
  BACKEND_PACKAGES as the runtime-string source of truth.
- verify-cordis-config: a composition mounting -auto must declare both
  backends as dependencies (negative-tested), since keyless Linux CI only
  ever resolves browse and would hide a dropped -native dep.
- apps/web scaffold: pin -browse via disable+insert (goldens are
  interaction-specific); fix the stale workspace-flow comment.
- docs/module-graph.md regenerated; README + Agent Note document the
  ssh -L shape, the PATH-only probe, and the new gate (zh pairs re-paired).
- composition spec: assert teardown quiescence without a loader await,
  cover external entry removal, and await the loader's self-dispose
  disabled-persist so it cannot race temp-dir teardown.

.agents/notes/implemented/feature/2026-07-29-directory-picker-adaptive-default.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 .agents/notes/implemented/feature/2026-07-29-directory-picker-adaptive-default.md
-2026-07-29-directory-picker-adaptive-default.md: ae5748259f162503300360d6cca43bec996afdb6
-2026-07-29-directory-picker-adaptive-default.zh.md: acabeb80604b473289fa441e6d9d913e4a8f87d0
+2026-07-29-directory-picker-adaptive-default.md: 7ff6529bb8e445f63343b1019ac520f56b19d5e4
+2026-07-29-directory-picker-adaptive-default.zh.md: a2a2d8ec4c91a347eedfc3aa3413b091ee847934