[Device support] realme RMX3988

Thanks for helping add support for your device. The details below were collected on-device.

### Device

```
Amply device-support request
report_schema=10
app_version=0.5.0-beta0 (500000)
distribution=foss/beta
manufacturer=realme
brand=realme
model=RMX3988
device=RE5CA3L1
product=RMX3988
fingerprint=realme/RMX3988/RE5CA3L1:16/BP2A.250605.015/U.R4T2.4027c0c-1b96b9b-1ba9cca:user/release-keys
android_sdk=36
android_release=16
is_phone=true
has_charging_optimization=false
one_ui_version=none
hyperos_version=none
oplus_rom_version=16
is_lineageos=false
lineageos_version=none
is_grapheneos=false
lineage_cc_provider=unknown
lineage_cc_mode=unknown
lineage_cc_limit_mechanism=UNKNOWN
probe_protect_battery=absent
probe_battery_charge_limit=absent
probe_regular_charge_protection=present
probe_smart_charge_protection=present
has_lineage_settings_provider=false
adapter=oneplus-lab
adapter_matched=true
adapter_control_enabled=false
contribution_wanted=true
battery_charging_status=0
battery_plugged=false
```

### What is the manufacturer's battery-protection feature called on this device? (optional)

Start by tracing how the existing oneplus-lab adapter handles the reported realme RMX3988 device and compare its battery-protection probes with the device report. Confirm the manufacturer's battery-protection feature name and determine what support change is needed; the issue is complete when the device's support behavior is correctly identified and documented or implemented.

Written by the indexing model from the issue text.