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/tools/opt11p4_replay.py

@@ -20,6 +20,8 @@ days; the 2026-09-24 PV recording is only in the live Home Assistant):
 * `national`: the Belgian day-ahead forecast itself, scaled to the site
   (one factor: the site's total over the national total, all days). It
   carries local weather differences too, so it is the harder test.
+* `zero`: a forecast of no sun at all (is the gain the forecast's, or only
+  Leftover solar buying the evening's shortfall?).
 * `high`: `national` x 1.5. `missing`: the sensor is configured but reads
   `unavailable`. The sensor has Open-Meteo's shape (state = kWh left today,
   `wh_period` = Wh per hour); `--shape state` drops `wh_period`
@@ -98,6 +100,8 @@ def forecast_table(kind, house, days):
     day_of = {h: datetime.fromtimestamp(h, LOCAL).date() for h in pv}
     if kind in ("perfect", "missing"):
         out = dict(pv)
+    elif kind == "zero":
+        out = {h: 0.0 for h in pv}
     elif kind == "recorded":
         ratio = {}
         for d in set(day_of.values()):
@@ -176,7 +180,7 @@ def main():
     ap.add_argument("--variant", default="p4_ls")
     ap.add_argument("--fc", default="recorded",
                     choices=("none", "recorded", "national", "perfect",
-                             "high", "missing"))
+                             "high", "missing", "zero"))
     ap.add_argument("--prices", default="epex2025",
                     choices=("epex2025", "real2026"))
     ap.add_argument("--shape", default="periods",