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/services/project-packager.ts

@@ -9,7 +9,7 @@ import {
 } from 'node:fs/promises';
 import { dirname, isAbsolute, join, relative, sep } from 'node:path';
 import type { ProjectType } from '../../shared/project-config';
-import { readProjectConfig } from '../opencode/project-config';
+import { readCodingProjectConfigV2 } from '../coding-projects/project-config';
 import { writeStoredZip } from './streaming-zip';
 
 type PublishableProjectType = Exclude<ProjectType, 'custom'>;
@@ -45,6 +45,7 @@ const EXCLUDED_DIRECTORY_NAMES = new Set([
   '.kube',
   '.next',
   '.niancode',
+  // Legacy runtime metadata is inert product data and is never publishable.
   '.opencode',
   '.project-docs',
   '.turbo',
@@ -267,7 +268,7 @@ export async function createStaticProjectPackage(input: {
 }
 
 async function readPublishableProjectType(projectPath: string): Promise<PublishableProjectType> {
-  const result = await readProjectConfig(projectPath);
+  const result = await readCodingProjectConfigV2(projectPath);
   if (result.status === 'invalid') {
     throw new ProjectPackageError(
       'PROJECT_CONFIG_INVALID',