Summary

Refactored AI agents and prompts system to improve maintainability and consistency across the CLI.

Closes #76 . Closes #67

Changes

New Agent Architecture

• Created unified AIAgentTool interface in src/lib/agents/
• Consolidated Claude and Gemini implementations with consistent error handling
• Added proper error types: MissingAIAgentError and InvokeAIAgentError

Centralized Prompts

• Moved all prompt logic to PromptBuilder class in src/lib/prompt.ts
• Eliminated duplicate prompts between Claude and Gemini implementations

JSON Parsing Utility

• Created robust parser in src/utils/json-parser.ts
• Handles various AI response formats (with/without markdown blocks)
• Comprehensive error handling with detailed messages

Updated Commands

• task.ts, iterate.ts, merge.ts now use the new agent system
• Replaced AIProvider interface with AIAgentTool
• Updated type definitions from TaskExpansion to IPromptTask

No breaking changes - all public APIs remain the same.