BatteryFastChargingProfile constraints:
1) Only modify `scripts/init.py`.
2) Candidate must define `build_charging_profile()` and return a dict with `currents_c` and `switch_soc`.
3) Keep the profile deterministic. Do not use randomness.
4) Optimize for charging speed without violating hard voltage (`4.25 V`) or hard temperature (`47 C`) limits.
5) Lower plating loss and lower aging loss improve the score, even for feasible solutions.
