review: symmetric policy-service type imports, drop stale inprocess peers, pin child-switch and fork-default cases

- child-agent.ts declares both policy-service augmentations as explicit
  empty type imports, so removing the ApprovalPolicy import cannot
  silently degrade ctx.get('approval') typing.
- dsh-subagent-inprocess no longer consumes the policy services in src,
  so its optional peers and tsconfig references are dropped; both
  policy-inheritance Agent Notes state the current ownership.
- The continuable suite pins that a later child-side switch beats the
  delegation snapshot and that an unswitched fork parent seeds no
  policy events.

packages/subagent/subagent-inprocess/package.json

@@ -28,22 +28,12 @@
     "@deepseek-ai/dsh-agent": "^0.0.1",
     "@deepseek-ai/dsh-invariants": "^0.0.1",
     "@deepseek-ai/dsh-llm": "^0.0.1",
-    "@deepseek-ai/dsh-sandbox-policy": "^0.0.1",
     "@deepseek-ai/dsh-session": "^0.0.1",
     "@deepseek-ai/dsh-subagent": "^0.0.1",
     "@deepseek-ai/dsh-system-prompt": "^0.0.1",
     "@deepseek-ai/dsh-tools": "^0.0.1",
-    "@deepseek-ai/dsh-user-approval": "^0.0.1",
     "cordis": "^4.0.0-rc.7"
   },
-  "peerDependenciesMeta": {
-    "@deepseek-ai/dsh-sandbox-policy": {
-      "optional": true
-    },
-    "@deepseek-ai/dsh-user-approval": {
-      "optional": true
-    }
-  },
   "devDependencies": {
     "@deepseek-ai/dsh-agent": "workspace:^",
     "@deepseek-ai/dsh-agent-loop": "workspace:^",

packages/subagent/subagent-inprocess/tsconfig.json

@@ -32,14 +32,8 @@
     {
       "path": "../../core/tools"
     },
-    {
-      "path": "../../sandbox/sandbox-policy"
-    },
     {
       "path": "../../support/invariants"
-    },
-    {
-      "path": "../../interaction/user-approval"
     }
   ]
 }