Merge branch 'master' into worktree/dsh-arg-parser

Integrate the Commander adapter with master's headless rework (dsh -p now boots
through AppCLIEntry — the same cordis.yml composition as dsh web, web-observable
while it runs — via toFetchHandler(ctx.apiProxy)).

- headless.ts: keep master's AppCLIEntry-based body but take the adapter's
  pre-parsed `task` (drop the re-added parseArgs). Old startHost path and the
  now-deleted packages/host/runtime dependency are gone.
- remove the stale packages/host/runtime dir left on disk by master's deletion
  (mirrors the earlier packages/ui/acp cleanup).

knip.json

@@ -57,11 +57,6 @@
       ]
     },
     "packages/host/webserver": {
-      "project": [
-        "src/**/*.ts"
-      ]
-    },
-    "packages/host/runtime": {
       "entry": [
         "tests/**/*.spec.ts"
       ],