Wire sizing and protection

TASK: Wire sizing and circuit protection.

For each load, choose a fuse and a wire gauge with these rules, in this order:
1. Fuse: the smallest rating in `fuses` that is >= 1.25 x the load current. If none is large enough, fuse and gauge are both "NONE".
2. Wire: the thinnest wire in `wireTable` (highest gauge number) that meets BOTH:
   a. ampacityA >= the chosen fuse rating, and
   b. voltage drop <= maxDropPct % of supplyV, where drop (V) = currentA x 2 x lengthM x ohmPerKm / 1000 (feed and return both run in wire).
   If no wire meets both, gauge is "NONE" and dropV is null.
3. dropV is the voltage drop on the chosen wire, rounded to 3 decimal places.

wireTable:
[
  {"gauge":24,"ohmPerKm":84.2,"ampacityA":3},
  {"gauge":22,"ohmPerKm":52.9,"ampacityA":5},
  {"gauge":20,"ohmPerKm":33.3,"ampacityA":7.5},
  {"gauge":18,"ohmPerKm":21,"ampacityA":10},
  {"gauge":16,"ohmPerKm":13.2,"ampacityA":13},
  {"gauge":14,"ohmPerKm":8.3,"ampacityA":17},
  {"gauge":12,"ohmPerKm":5.2,"ampacityA":23},
  {"gauge":10,"ohmPerKm":3.3,"ampacityA":33},
  {"gauge":8,"ohmPerKm":2.1,"ampacityA":46}
]

fuses: [1,2,3,5,7.5,10,15,20,25,30,40]

Loads:
[
  {"id":"LD1","currentA":13.8,"lengthM":3,"supplyV":28,"maxDropPct":5},
  {"id":"LD2","currentA":1.1,"lengthM":5.5,"supplyV":28,"maxDropPct":5},
  {"id":"LD3","currentA":12,"lengthM":10.1,"supplyV":14,"maxDropPct":3},
  {"id":"LD4","currentA":6.5,"lengthM":22.9,"supplyV":28,"maxDropPct":3}
]

Output format (JSON, exactly these keys):
```json
{
 "loads": [
  {
   "id": "LD1",
   "fuseA": 7.5,
   "gauge": 18,
   "dropV": 0.412
  }
 ]
}
```