Publish EIC event-code and protection sensors for seplos_bms_v3_ble

[syssi]

Summary

decode_eic_data_ parses the EIC status block (registers 0x2200–0x2248, function 0x01) but only published problem_code/problem_text. This publishes the remaining EIC entities — already defined in the schema, example YAML and header, but never fed:

Entity	Type	Source	Meaning
system_state_code	sensor	data[0] (TB09)	operating state
voltage_event_code	sensor	data[1] (TB02)	voltage events
temperature_event_code	sensor	data[2]+data[3] (TB03+TB04)	combined cell + ambient/power temperature events
current_event_code	sensor	data[4] (TB05)	current events
voltage_protection	binary_sensor	data[1] != 0	voltage fault
temperature_protection	binary_sensor	data[2] != 0 || (data[3] & 0x3F) != 0	temperature fault (heating masked)
current_protection	binary_sensor	data[4] != 0 || data[5] != 0	current fault
system_fault	binary_sensor	data[9] != 0	hard fault (TB15)
heating	binary_sensor	data[3] & 0x40	low-temperature heating active (TB04 bit6)

TB03 + TB04 combined

The cell-temperature (TB03, data[2]) and ambient/power-temperature (TB04, data[3]) tables are merged into one temperature_event_code — TB03 in the high byte, TB04 in the low byte — so neither table is dropped and no extra sensor is needed. The "low temperature heating" bit (TB04 bit6) is kept in the raw code but masked out of temperature_protection, since heating is an operating state, not a fault — it instead drives a dedicated heating binary sensor.

Changes

• seplos_bms_v3_ble.cpp: publish the four event-code sensors and four protection/fault binary sensors in decode_eic_data_; combine TB03+TB04; drop the now-redundant per-event ESP_LOGD (the values are published) and the unused name field on the lookup table
• frames.h: new EIC_DATA_AMBIENT_TEMP capture (TB04 real fault bit, distinct from the heating status bit)
• seplos_bms_v3_ble_test.cpp: tests for every event code and binary sensor, the combined temperature path, the heating-vs-fault distinction, and the null-sensor path

No test.host.yaml changes — sensors are exercised by the unit tests and the example YAML already lists every EIC entity.

Testing

• pre-commit run --all-files — all hooks pass
• ./run-cpp-tests.sh seplos_bms_v3_ble seplos_bms_v3_ble_pack — 36/36 pass, incl. 11 EIC tests