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/packmode.py

@@ -49,10 +49,10 @@ SELLING_ENABLED = False
 # The modes that may charge from the grid in a cheap run with no day plan.
 # Leftover solar takes solar only then (owner decision 2026-09-29, option A).
 GRID_CHARGE_MODES = (CHEAP_HOURS,)
-# OPT-11 P4: with a fresh solar forecast, the day plan (dayplan.py) may also
-# let Leftover solar charge from the grid, by the shortfall only. Solar first
-# never charges from the grid.
-PLAN_CHARGE_MODES = (LEFTOVER_SOLAR, CHEAP_HOURS)
+# OPT-11 P4: with a fresh solar forecast, the day plan (dayplan.py) lets
+# Leftover solar charge from the grid, by the shortfall only. Cheap hours only
+# ignores the plan (fills to the ceiling); Solar first never grid-charges.
+PLAN_CHARGE_MODES = (LEFTOVER_SOLAR,)
 
 
 def enabled(opts) -> bool: