SAFETY-112: say plainly that control waits for Home Assistant to start

The Supervisor proxy answers 502 to every add-on read, write and websocket
until Core is RUNNING (proxy.py api()/websocket() -> check_api_state()), so
the add-on cannot control while a slow integration holds HA's start, even
with its entities live. Measured on a safety112 repro stack with the
2026.08.0 proxy code: first write 1.0-4.4 s after RUNNING, 238-300 s after
live readings. Not routed around (DECISIONS/SAFETY-112-...).

While the API does not answer, the first status row is red and is the
banner ("Waiting for Home Assistant to finish starting"), Home shows a
"waiting" state in EN/NL instead of "Needs you now", and the log adds a
"still waiting" line every 5 minutes and the wait's length at the end.
A safety stop, a stalled loop or shadow mode keeps its own headline.
Control, writes, heartbeat and the stand-down are unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

goodwe_controller/app/messages.py

@@ -436,6 +436,17 @@ def banner_shadow(latched: bool) -> str:
     return "Shadow mode: the battery is not controlled. Inverters stay at 0 W."
 
 
+def banner_ha_waiting() -> str:
+    """SAFETY-112: the Supervisor passes nothing on until Home Assistant has
+    finished starting, so the add-on can neither read nor write."""
+    return "Waiting for Home Assistant to finish starting"
+
+
+def row_ha_waiting() -> str:
+    return ("Home Assistant is not answering, perhaps it is still starting. "
+            "Control resumes by itself when it answers.")
+
+
 # Rows: control and the meter. "Control" is what the add-on does, as in
 # "start control" (STYLE.md section 4).
 def row_controller_starting() -> str:
@@ -1055,6 +1066,10 @@ def status_samples() -> list:
         ("banner_setup_only", None, banner_setup_only()),
         ("row_setup_only", AMBER, row_setup_only()),
         ("banner_shadow", None, banner_shadow(True)),
+        ("banner_not_ready", None, banner_not_ready(
+            {"text": row_ha_waiting(), "banner": banner_ha_waiting()})),
+        ("banner_ha_waiting", None, banner_ha_waiting()),
+        ("row_ha_waiting", RED, row_ha_waiting()),
         ("row_controller_starting", GREEN, row_controller_starting()),
         ("row_controller_ran", GREEN, row_controller_ran(2)),
         ("row_controller_stalled", RED, row_controller_stalled(45, 30)),