feat(permission): permissions projection unit and /permission command

The read side becomes the 'permissions' session projection: src/types.ts is
the key declaration's one home (PermissionSelect = whole select: table
options in declaration order plus a current-only 'custom'), served through
./types and the ./client re-export. The unit folds the three whole-value
knob events (permission/preset, sandbox/mode, approval/policy) into a plain
KnobState and views the select over the composition defaults the service
already owns; current() shares the same derive step, so the fold exists
once. The write side becomes the /permission command (the /plan
registration shape): bare invocation reports the current preset and the
table, a preset argument switches through set() immediately — no turn
anchoring (knob events need no enclosure), no dedicated RPC. Both children
activate only when their registry is composed.

packages/ui/permission/package.json

@@ -15,12 +15,21 @@
       "types": "./lib/types/invariant.d.ts",
       "default": "./lib/invariant.js"
     },
+    "./types": {
+      "types": "./lib/types/types.d.ts",
+      "default": "./lib/types/types.js"
+    },
+    "./client": {
+      "types": "./lib/types/client.d.ts",
+      "default": "./lib/types/client.js"
+    },
     "./src/*": "./src/*",
     "./package.json": "./package.json"
   },
   "files": [
     "lib/index.js",
     "lib/invariant.js",
+    "lib/types/**/*.js",
     "lib/types/**/*.d.ts",
     "lib/types/**/*.d.ts.map",
     "src"
@@ -28,22 +37,27 @@
   "license": "BSD-3-Clause",
   "peerDependencies": {
     "@deepseek-ai/dsh-bash": "^0.0.1",
+    "@deepseek-ai/dsh-commands": "^0.0.1",
     "@deepseek-ai/dsh-invariants": "^0.0.1",
     "@deepseek-ai/dsh-sandbox": "^0.0.1",
     "@deepseek-ai/dsh-sandbox-policy": "^0.0.1",
     "@deepseek-ai/dsh-session": "^0.0.1",
+    "@deepseek-ai/dsh-session-projection": "^0.0.1",
     "@deepseek-ai/dsh-user-approval": "^0.0.1",
     "cordis": "^4.0.0-rc.7"
   },
   "dependencies": {
-    "schemastery": "^3.18.0"
+    "schemastery": "^3.18.0",
+    "zod": "^4.4.3"
   },
   "devDependencies": {
     "@deepseek-ai/dsh-bash": "workspace:^",
+    "@deepseek-ai/dsh-commands": "workspace:^",
     "@deepseek-ai/dsh-invariants": "workspace:^",
     "@deepseek-ai/dsh-sandbox": "workspace:^",
     "@deepseek-ai/dsh-sandbox-policy": "workspace:^",
     "@deepseek-ai/dsh-session": "workspace:^",
+    "@deepseek-ai/dsh-session-projection": "workspace:^",
     "@deepseek-ai/dsh-user-approval": "workspace:^",
     "cordis": "^4.0.0-rc.7"
   }