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/testing/index.ts

@@ -0,0 +1,16 @@
+/**
+ * testing/ — Test infrastructure for DevClaw integration tests.
+ *
+ * Exports:
+ * - TestProvider: In-memory IssueProvider with call tracking
+ * - createTestHarness: Scaffolds temp workspace + mock runCommand
+ */
+export { TestProvider, type ProviderCall } from "./test-provider.js";
+export {
+  createTestHarness,
+  type TestHarness,
+  type HarnessOptions,
+  type CommandInterceptor,
+  type CapturedCommand,
+  type BootstrapFile,
+} from "./harness.js";