Alternating Flux NeoForge

Fixes
- AF Transformer: the HV-side wire now attaches at the correct height (it sat ~3 pixels too high — it now sits flush, exactly like the MV wire on a stock IE HV transformer)
- Feedthroughs: AF wires now reach the relay cup's tip instead of stopping short, and the feedthrough's hitbox matches the model properly
- Shock damage hardening: setting `shockDamageBase` or `damageRadius` to 0 now disables shock *completely* (including effects on Faraday suits), and a config edge case that could produce broken damage values is gone

Compatibility
- Now built and tested against Immersive Engineering 12.4.2 (requires IE 12.1+)
- Added update-checker support — you'll get a notification in-game when a new version is out

Notes
- The "4× HV" rating is the AF line's total trunk capacity: each AF↔HV transformer still moves at most the HV rate (32,768 IF/t), so feed big trunks with multiple transformers
- Minor cleanup: removed leftover unused files from the jar