feat: Introduce @automaker/prompts package for AI prompt templates

Changes:
- Added a new package, @automaker/prompts, containing AI prompt templates for enhancing user-written task descriptions.
- Implemented four enhancement modes: improve, technical, simplify, and acceptance, each with corresponding system prompts and examples.
- Updated relevant packages to utilize the new prompts package, ensuring backward compatibility with existing imports.
- Enhanced documentation to include usage examples and integration details for the new prompts.

Benefits:
✅ Streamlined AI prompt management across the codebase
✅ Improved clarity and usability for AI-powered features
✅ Comprehensive documentation for developers

All tests passing.

libs/utils/src/index.ts

@@ -10,6 +10,7 @@ export {
   isAuthenticationError,
   classifyError,
   getUserFriendlyErrorMessage,
+  getErrorMessage,
 } from './error-handler.js';
 
 // Conversation utilities
@@ -48,3 +49,9 @@ export {
   mkdirSafe,
   existsSafe,
 } from './fs-utils.js';
+
+// Path utilities
+export {
+  normalizePath,
+  pathsEqual,
+} from './path-utils.js';