PRICE-02: the trading verdict skips price periods that have ended

TariffPlan.arbitrage(now=...) drops the points whose period has ended
(end <= now), so the cheapest and dearest point can still be traded.
decide() (modes off), the modes-on allowed() gate and the Home verdict
all pass their own now. Hourly feeds and the static tariff are unchanged.
The off-peak sentence and the charge/discharge sentences say "price
period". Tests: test_price02.py; test_arbitrage.py rolls its whole-day
plans to start at now; test_modes_p3.py part 1 digests leave the trade
sentence out (commands unchanged on 7a00f12, 90bc901 and this tree).

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

goodwe_controller/DECISIONS/PRICE-02-the-verdict-skips-ended-periods.md

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+# PRICE-02 - the trading verdict skips price periods that have ended
+
+**Status: for review.** Tests: `test_price02.py`. Found by AUDIT-01 (F1).
+
+The refresh floors the plan to the top of the hour, so on the 15-minute feed
+it holds the periods of this hour that are already over. The verdict took the
+cheapest and dearest over every point. With modes off it could aim at a period
+that had passed and then do nothing, for up to 45 min plus the refresh lag.
+With modes on the `allowed()` gate could be open only because of such a period.
+
+Decision: `TariffPlan.arbitrage(now=...)` drops the points whose period has
+ended (`end <= now`, the span `price._cover_table()` gives, as
+`priceruns.firm_slots()` does). Its three callers pass their own `now`:
+`arbitrage.decide()`, `Controller._mode_roles()` and `homeview.trade_verdict()`.
+
+- Taken in the verdict, not when the plan is built: a plan built at 03:00 is
+  still used at 03:20, and the Home chart keeps the day's earlier bars.
+- An hourly point that is still current stays in, so hourly feeds and the
+  static day/night plan give the same verdict as before.
+- `now=None` keeps the old reach (the whole series); only tests leave it out.
+- The idle sentence now reads "now is not the cheapest or the dearest price
+  period". Other sentences that say "hour" (AUDIT-01 T6) are not touched here.
+- Not changed here: F2 (static profile sampled at HH:00) and F3 (carried value).
+
+Measured: with price off, and on a static tariff, every command over the
+modes-off replay is byte-identical. On the dynamic replay a sale quotes a
+smaller "above the cheapest" figure once the first cheap period is over.