feat(coding): add plugin capability policy registry

shared/coding-conversation-contracts.ts

@@ -1,4 +1,6 @@
-import type { DataServiceToolDetailsV1 } from './data-service';
+import type { CapabilityResultV1 } from './data-service';
+
+export type { CapabilityBillingReceiptV1, CapabilityResultV1 } from './data-service';
 
 export type ConversationThinkingLevel = 'off' | 'minimal' | 'low' | 'medium' | 'high';
 
@@ -194,8 +196,6 @@ export interface RuntimeContextDetailsV1 {
   }>;
 }
 
-export type { DataServiceToolDetailsV1 } from './data-service';
-
 export interface SubagentDetailsV1 {
   schema: 'subagent.v1';
   dispatchId: string;
@@ -218,7 +218,7 @@ export type KnownToolDetails =
   | AgentBrowserDetailsV1
   | GameAssetsDetailsV1
   | RuntimeContextDetailsV1
-  | DataServiceToolDetailsV1
+  | CapabilityResultV1
   | SubagentDetailsV1;
 
 export interface ConversationToolNode {