refactor(cli): bail early in the arg adapter instead of returning errors as data

Address review and cut ceremony: the adapter no longer models help/version/
errors as DshInvocation members. Commander owns those under exitOverride — it
prints usage or the diagnostic and one try/catch in parseDshArgs turns the
thrown CommanderError into process.exit with the intended code. bin.ts drops its
help/version/error cases; the union is the three real modes.

Domain checks bail via command.error(print + exit 1): --prompt rejects an empty
task or a stray config/--resume, empty --resume= fails loud, and --host/--port
are validated. A repeated --resume or a flag captured as a value is Commander's
standard behavior, left alone (a bad id fails loud downstream). dsh --help
discloses web via addHelpText. Net: args.ts 185 -> 112 lines.

Also fixes review nits: built-bin e2e resolves on `close`; the /resume handoff
uses `dsh --resume=<id> -- <config>` so a config named `web` stays a positional;
and stale prose (cordis.yml comment, app-boot module doc + duplicate JSDoc,
ui/README, two feature notes, an agent-loop test name) tracks the shipped state.
Removes tui-demo's now-dead plugin-include dep and vendor/loader + app-boot
tsconfig references.

packages/examples/tui-demo/package.json

@@ -27,7 +27,6 @@
   ],
   "license": "BSD-3-Clause",
   "peerDependencies": {
-    "@cordisjs/plugin-include": "^1.0.4",
     "@cordisjs/plugin-loader": "^1.0.0-rc.5",
     "@deepseek-ai/dsh-agent": "^0.0.1",
     "@deepseek-ai/dsh-agent-loop": "^0.0.1",
@@ -51,7 +50,6 @@
     "schemastery": "^3.17.0"
   },
   "devDependencies": {
-    "@cordisjs/plugin-include": "workspace:^",
     "@cordisjs/plugin-loader": "workspace:^",
     "@deepseek-ai/dsh-agent": "workspace:^",
     "@deepseek-ai/dsh-agent-loop": "workspace:^",

packages/examples/tui-demo/tsconfig.json

@@ -14,12 +14,6 @@
     {
       "path": "../../../vendor/schemastery"
     },
-    {
-      "path": "../../../vendor/loader"
-    },
-    {
-      "path": "../../ui/app-boot"
-    },
     {
       "path": "../../core/agent"
     },