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/coding-projects/project-store.ts

@@ -16,6 +16,12 @@ export interface CodingProjectStoreData {
   activeProjectId: string | null;
 }
 
+export type CodingProjectStoreChange =
+  | { type: 'upsert'; project: CodingProject }
+  | { type: 'remove'; projectId: string };
+
+export type CodingProjectStoreListener = (change: CodingProjectStoreChange) => void;
+
 export interface CodingProjectStorage {
   read(): Promise<CodingProjectStoreData | undefined>;
   write(data: CodingProjectStoreData): Promise<void>;
@@ -67,8 +73,7 @@ export function createCodingProjectStorageFromStore(
 export async function createElectronCodingProjectStorage(): Promise<CodingProjectStorage> {
   const Store = (await import('electron-store')).default;
   const store = new Store<{ projects?: CodingProjectStoreData }>({
-    // Preserve the installed-user storage identity while replacing the
-    // OpenCode-owned service and types with the product-owned store.
+    // Legacy installed-user storage identity. Renaming it would orphan projects.
     name: 'opencode-projects',
   });
   return createCodingProjectStorageFromStore(store, 'projects');
@@ -88,6 +93,17 @@ export function createCodingProjectStore(
   const createId = options.createId ?? randomUUID;
   const now = options.now ?? (() => new Date().toISOString());
   let mutationTail = Promise.resolve();
+  const listeners = new Set<CodingProjectStoreListener>();
+
+  function emit(change: CodingProjectStoreChange): void {
+    for (const listener of listeners) {
+      try {
+        listener(change);
+      } catch {
+        // Persistence must not fail because an observer failed.
+      }
+    }
+  }
 
   async function readData(): Promise<CodingProjectStoreData> {
     return (await storage.read()) ?? emptyStoreData();
@@ -124,6 +140,7 @@ export function createCodingProjectStore(
       data.projects[project.id] = project;
       if (activate) data.activeProjectId = project.id;
       await storage.write(data);
+      emit({ type: 'upsert', project });
       return project;
     });
   }
@@ -164,8 +181,14 @@ export function createCodingProjectStore(
         delete data.projects[projectId];
         if (data.activeProjectId === projectId) data.activeProjectId = null;
         await storage.write(data);
+        emit({ type: 'remove', projectId });
       });
     },
+
+    subscribe(listener: CodingProjectStoreListener): () => void {
+      listeners.add(listener);
+      return () => listeners.delete(listener);
+    },
   };
 }