fix: add projectId to remaining unscoped API functions

- GitHub import functions: apiImportGitHubIssue, apiBatchImportGitHubIssues, apiImportGitHubPull
- Task file operations: fetchFileList, fetchFileContent, saveFileContent
- AI title summarization: summarizeTitle
- Terminal command execution: execTerminalCommand
- Wire projectId through GitHubImportModal, AppModals, useFileBrowser, useFileEditor hooks

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

packages/engine/src/index.ts

@@ -35,6 +35,7 @@ export { TokenCapDetector, type TokenCapCheckResult } from "./token-cap-detector
 export { SelfHealingManager, type SelfHealingOptions } from "./self-healing.js";
 export { PluginRunner, type PluginRunnerOptions } from "./plugin-runner.js";
 export { ProjectManager } from "./project-manager.js";
+export { ProjectEngine, type ProjectEngineOptions } from "./project-engine.js";
 export { NodeHealthMonitor } from "./node-health-monitor.js";
 export { PeerExchangeService, type PeerExchangeServiceOptions, type SyncResult } from "./peer-exchange-service.js";
 export { RemoteNodeClient } from "./runtimes/remote-node-client.js";