[Feature] Support Cline / Roo Code conversation history and token usage

Description Cline (formerly Claude Dev) and Roo Code store task execution history and token statistics locally in VS Code's global storage. We'd love to support parsing Cline / Roo Code sessions directly in agent-cost. Storage Locations Cline: ~/.config/Code/User/globalStorage/saoudrizwan.claude-dev/tasks//api_conversation_history.json Roo Code: ~/.config/Code/User/globalStorage/rooveterinaryinc.roo-cline/tasks//api_conversation_history.json Expected Log Format The api_conversation_history.json file contains an array of message turns with Anthropic-style usage: [ { "role": "user", "content": "..." }, { "role": "assistant", "content": "...", "usage": { "input_tokens": 1250, "output_tokens": 420, "cache_read_input_tokens": 8500, "cache_creation_input_tokens": 300 } } ] How to Implement Add src/agent_cost/parsers/cline.py with parse_cline_session(path: Path) -> SessionStats. Map input_tokens, output_tokens, cache_read_input_tokens, cache_creation_input_tokens into SessionStats. Add signature sniffing and routing in src/agent_cost/parsers/detect.py. Add unit tests in tests/test_cline_parser.py. PRs welcome!