UX-53: Home draws a grid charge only where the add-on will take it

Modes on: Controller._mode_roles() files the trade gate it just asked as mode_gate; while it refuses, Home draws no grid charge and marks no cheap quarter. Modes off: a charge after the last dear period is asked of the same gate at its own start (homeview.leg_taken) and dropped when refused there. Words: "Lowest/Highest price left" (EN, NL); a flat remainder on a dynamic or day/night site is no longer called a fully fixed product. No change to control decisions, commands or options. Co-Authored-By: Claude <noreply@anthropic.com>
2026-10-26 11:15:29 +01:00
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+# UX-53 - Home draws a grid charge only where the add-on will take it
+
+**Status: DONE 2026-10-26 (owner go 2026-10-25, from the PRICE-02 rig test F-1 and F-2).**
+
+## Decision
+
+Home asks the add-on's own gate, and does not decide for itself.
+
+- **Modes on.** `Controller._mode_roles()` files the gate it just asked
+  (`TariffPlan.arbitrage()` with the measured peak guard) as `mode_gate`: None
+  when it allowed a charge, else its reason (`peak`, `not_worth`,
+  `not_covered`). While it is set, `homeview.mode_runs()` draws no grid charge
+  and `price_windows()` marks no cheap quarter. Control never reads it. A
+  refusal that is not the gate (no measured headroom, a battery cycling) is
+  not filed, so those pages are as before.
+- **Modes off.** A charge the verdict puts after its last dear period is
+  refused when its time comes: the quarters left are all equal. `leg_taken()`
+  asks `trade_verdict()` (the control cycle's own call) at the leg's start and
+  keeps the leg only if the gate allows it there. A leg in progress is the verdict's own answer now. The
+  sale, "Tomorrow:" lines and chart marks use the same answer.
+- **Words.** "Lowest/Highest published price" becomes "Lowest/Highest price
+  left" (the verdict reads only the periods not yet over). The flat-tariff
+  refusal calls a site "a fully fixed product" only when its product is fixed.
+
+## What does not change
+
+No control decision, command or option. Day/night and hourly sites with a
+second day of prices keep both legs at every half hour of a day
+(`test_ux53.py` part 4); price-off sites draw nothing, as before.
+
+## Limits
+
+The leg's gate is asked on today's plan, as the control cycle will find it at
+that time. A plan that gets new prices in between is drawn again at the next
+refresh. While the peak guard holds, a modes-on page shows no charge for that
+time, as the modes-off page already did.