SMA-2: each inverter is reached through a driver; GoodWe behaviour unchanged

app/drivers.py holds one Driver per roster entry (configured, actuator_id,
limits, read, write, release, probe, link_stale_s, batt_bound, settle_s, brand,
words). GoodWeEsphomeDriver makes the calls the code it replaced made, in the
same order. Inverter gets driver; has_writer, is_live and link_note read it. The
SoC/power read, the write, the device range (run_control, amain, the settings
panel), rule 2 per unit and the SAFETY-28 census go through it.

setpoint_entity is optional per entry beside driver, host, port, unit_id and
maintenance; only goodwe_esphome is selectable, the rest are checked and unused.

Co-Authored-By: Claude <noreply@anthropic.com>

goodwe_controller/app/uilayout.py

@@ -302,6 +302,19 @@ DERIVED = {
 HIDDEN: dict = {"price_service_token": "a secret, set on the Configuration tab"}
 
 
+# SMA-2. Per-entry keys of the inverter list the page never shows. They pick and
+# address an inverter driver, only `goodwe_esphome` is selectable, and nothing
+# reads the other four yet. An entry's keys the page does not draw travel
+# through a save as stored (uimodel._roster_decode keeps the whole entry).
+ROSTER_HIDDEN: dict = {
+    "driver": "only goodwe_esphome for now; empty means that",
+    "host": "not read yet",
+    "port": "not read yet",
+    "unit_id": "not read yet",
+    "maintenance": "not read yet",
+}
+
+
 def fields():
     """Every field once, in page order, roster fields after `inverters`."""
     for group in GROUPS: