Replace scattered println!/eprintln! with structured tracing macros throughout
supervisor, scheduler, and web modules. Add LogConfig (file + level) to Config
and a new logging module that initialises a stderr + optional non-blocking file
appender on `warpgate run`. Remove the in-memory LogBuffer/LogEntry from
AppState; the web /api/logs endpoint now reads the log file directly with
from_line/lines pagination. `warpgate log` replaces journalctl with `tail`,
and the Logs tab Alpine.js is updated to match the new API response shape.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
grabbit
64d6171ec9