Logfmt ↔ JSON Converter

Logfmt Converter transforms between logfmt and JSON formats. Logfmt (log format) is a plain-text logging convention popularized by Heroku where each log line contains space-separated key=value pairs: `method=GET path=/api status=200 duration=45ms`. It's human-readable in the terminal but harder to query programmatically. Converting to JSON gives you structured data that's easy to filter, search, and analyze with log aggregation tools.

The parser splits each line on spaces while respecting quoted values (key="a b"). Boolean flags (words without =) are parsed as key=true. The encoder reverses this: JSON string values become key=value, numbers remain unquoted, and booleans become bare flags.