A malformed due: value (e.g. due:2024-13-99) left DueDate nil, causing
ToRemind to silently emit nothing for that task. Now ParseLine reports
an error so the problem surfaces on stderr instead of vanishing.
Also fixes staticcheck QF1012 (WriteString(Sprintf(...)) -> Fprintf)
flagged by the IDE in ToRemind.
- 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
