🔧 Improvements

Freecam detection now only probes once, on join, instead of repeating every probe-interval-seconds. Periodic re-probing was popping the hidden anvil GUI mid-session, which hijacks left-click input and was interrupting active PVP. This isn't just disabled by default anymore, it's removed entirely from the code, there's no toggle to bring back the old always-on behavior. A player who installs Freecam mid-session won't be caught until their next join, or via /fpac freecamtest on demand.

Shortened probe-timeout-ticks default from 20 to 5, so even the one-time join probe is a much briefer flash.

Cleaned up config.yml comments across the board: removed decorative dividers, replaced dense inline notes with plain readable sentences. No keys or default values changed, this is comment/formatting only.