feat: enhance workflow and testing infrastructure

- Introduced ExecutionMode type for project execution modes (parallel, sequential).
- Updated SetupOpts to use ExecutionMode instead of string literals.
- Enhanced workflow states to include a new "In Review" state with appropriate transitions.
- Implemented TestHarness for end-to-end testing, including command interception and workspace setup.
- Created TestProvider for in-memory issue tracking during tests.
- Refactored project registration and setup tools to utilize ExecutionMode.
- Updated various tools to ensure compatibility with new workflow and execution modes.
- Added new dependencies: cockatiel for resilience and zod for schema validation.

lib/setup/index.ts

@@ -14,6 +14,7 @@ import { createAgent, resolveWorkspacePath } from "./agent.js";
 import { writePluginConfig } from "./config.js";
 import { scaffoldWorkspace } from "./workspace.js";
 import { DATA_DIR } from "./migrate-layout.js";
+import type { ExecutionMode } from "../workflow.js";
 
 export type ModelConfig = Record<string, Record<string, string>>;
 
@@ -33,7 +34,7 @@ export type SetupOpts = {
   /** Model overrides per role.level. Missing levels use defaults. */
   models?: Record<string, Partial<Record<string, string>>>;
   /** Plugin-level project execution mode: parallel or sequential. Default: parallel. */
-  projectExecution?: "parallel" | "sequential";
+  projectExecution?: ExecutionMode;
 };
 
 export type SetupResult = {