Merge origin/master: session projection base, command channel, composer seats

Resolution follows the reattachment plan: the #587 wire layer (planMode/
setPlanMode RPC, prompt.planMode, client Session projection fences) is
dropped in favor of the session-projection base now on master; master
structure wins in all shared files. Kept from the PR side: the approval-only
pending filter in ChatView (questions render solely through the composer
takeover) and the auto-merged QuestionComposer improvements. The deleted
host/runtime package and retired test carriers are removed with master.

apps/cli/tsconfig.json

@@ -14,9 +14,6 @@
     {
       "path": "../../packages/host/apiproxy"
     },
-    {
-      "path": "../../packages/host/runtime"
-    },
     {
       "path": "../../packages/host/webserver"
     },
@@ -26,6 +23,9 @@
     {
       "path": "../../packages/ui/app-boot"
     },
+    {
+      "path": "../../packages/ui/tui"
+    },
     {
       "path": "../../packages/util/paths"
     },
@@ -42,7 +42,16 @@
       "path": "../../packages/client/ui-theme"
     },
     {
-      "path": "../../packages/client/i18n"
+      "path": "../../packages/client/ui-settings"
+    },
+    {
+      "path": "../../packages/client/ui-settings-general"
+    },
+    {
+      "path": "../../packages/client/ui-models"
+    },
+    {
+      "path": "../../packages/client/locale"
     },
     {
       "path": "../../packages/client/ui-layout"