OPT-11 P4 review: Cheap hours ignores the plan; midnight-stale forecast; stricter ids

- Cheap hours only fills to the ceiling with or without a forecast, as the
  design (section 1) says. Skipping the sun's share cost 0.31 EUR on real
  2026 prices (29.72 against P3's 29.41) and saved nothing on the P3 set.
- A forecast reading from before local midnight is stale: until the
  integration refreshes, "left today" is still yesterday's 0 and
  "tomorrow" is really today.
- Forecast entity ids must be sensor.[a-z0-9_]+ (they go into the
  /api/states/<id> path).
- House profile: a stored day that is not a date, or is after today, is
  dropped instead of kept forever.
- Text: the forecast line says "for the rest of today"; the learning line
  no longer promises "tomorrow" (a plan needs one full day).
- Tests for four surviving review mutants (hour sample floor, the dear run
  after the cheap run, share by room, daytime use) and the fixes above.
- Replay tool: `--fc zero` (a forecast of no sun).

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

goodwe_controller/app/validate.py

@@ -328,6 +328,7 @@ WHAT IS DELIBERATELY *NOT* REFUSED, because it is untidy rather than unsafe:
 """
 
 import logging
+import re
 from typing import NamedTuple
 
 from . import dayplan, messages, pv, solarfc
@@ -2066,6 +2067,8 @@ def _margin_problems(opts: dict) -> list[str]:
 
 
 TRUST_RANGE_PCT = (30, 100)
+# A Home Assistant sensor id; it goes into the /api/states/<id> path.
+_SENSOR_ID = re.compile(r"sensor\.[a-z0-9_]+")
 FORECAST_KEYS = ("pv_forecast_entity", "pv_forecast_tomorrow_entity")
 
 
@@ -2083,7 +2086,7 @@ def _forecast_problems(opts: dict) -> list[str]:
         e = opts.get(key)
         if e is None or e == "":
             continue
-        if not isinstance(e, str) or not e.strip().startswith("sensor."):
+        if not isinstance(e, str) or not _SENSOR_ID.fullmatch(e):
             out.append(f"{S(key)} must be a sensor, like "
                        f"sensor.energy_production_today_remaining. It is "
                        f"{messages.shown(e)}.")