feat: remove legacy OpenCode runtime

Cut product flows over to Coding/Pi and retain only the migration-owned v1 boundary. Promote supported native optional packages because electron-builder omitted pnpm transitive optional closure from the packaged ASAR.

electron/api/coding-composition.ts

@@ -5,6 +5,7 @@ import { createCodingConversationStore } from '../coding-projects/conversation-s
 import { CodingProjectService } from '../coding-projects/project-service';
 import {
   createCodingProjectStore,
+  type CodingProjectStore,
   type CodingProjectStorage,
 } from '../coding-projects/project-store';
 import { CodingConversationService } from '../coding-runtime/conversation-service';
@@ -31,6 +32,7 @@ import {
 } from './coding-provider-auth';
 import { createCodingProductHost, type CodingProductComposition } from './coding-product-services';
 import { archivePiConversationSession } from '../coding-runtime/pi/resource-loader';
+import { resolveLegacyProjectModel } from '../coding-projects/legacy-v1';
 
 export interface CodingCompositionPaths {
   executablePath: string;
@@ -41,6 +43,7 @@ export interface CodingCompositionPaths {
 
 export interface CreateCodingCompositionOptions {
   storage: CodingProjectStorage;
+  projectStore?: CodingProjectStore;
   browser: AgentBrowserModule;
   paths: CodingCompositionPaths;
   localProxyCredential?: string;
@@ -70,7 +73,7 @@ export function resolveCodingPiRuntimePaths(input: {
 export function createCodingComposition(
   options: CreateCodingCompositionOptions,
 ): CodingProductComposition {
-  const projectStore = createCodingProjectStore(options.storage);
+  const projectStore = options.projectStore ?? createCodingProjectStore(options.storage);
   const attachments = new CodingAttachmentStore(
     path.join(options.paths.userDataDir, 'coding-runtime', 'attachments'),
   );
@@ -156,6 +159,12 @@ export function createCodingComposition(
     })),
   });
   const projects = new CodingProjectService(projectStore, {
+    migration: {
+      resolveLegacyModel: async ({ legacyModel }) => resolveLegacyProjectModel(
+        legacyModel,
+        await getProviderService().listAccounts(),
+      ),
+    },
     createConversationStore: conversationStoreForProject,
     onResourcesChanged: async (project) => {
       runtime.markResourcesStale();
@@ -195,6 +204,10 @@ export function createCodingComposition(
     conversations,
     runtime,
     host,
+    async sleep() {
+      const conversationIds = runtime.getDiagnostics().workers.map((worker) => worker.conversationId);
+      await Promise.allSettled(conversationIds.map((conversationId) => runtime.dispose(conversationId)));
+    },
     async shutdown() {
       await subagents.close();
       await runtime.shutdown();