feat: initial parser for todo.txt format with spec and test cases
- Add parser for todo.txt tasks supporting priority, dates, projects, contexts, and key:value metadata - Include full todo.txt format specification (SPECS.md) and visual description (description.svg) - Add sample test.todo.txt file with valid, borderline, and malformed cases - Initialize Go module and main entrypoint for parsing and JSON output - Add .gitignore for binary artifacts
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