PRICE-02 round 2: require now, undo the test loosening, analyse ties

- TariffPlan.arbitrage(now=...) is required (keyword-only, no default); so are
  homeview.trade_verdict/refusal_key's now. Existing test calls pass one.
- test_arbitrage.py: no module-level decide wrapper. Fixtures that probed a
  one-day plan after its extremes now hold two days (as a site does); the
  flap day gets a unique cheapest and dearest hour; the replay breaks its
  ties without direction. The flap bound is <= 4 and the replay check is
  len(_trades) < 365 again. 228 checks pass on the old and the new code.
- test_price02.py part 6: ties (equal quarters, a real 15-minute day,
  alternating hourly prices) and the required now.
- Identity pins: the masked digest is only for the older-tree comparison;
  this tree's own digests are pinned with nothing hidden.
- DECISIONS: the tie analysis with numbers.

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

goodwe_controller/test_modes_p3.py

@@ -67,27 +67,53 @@ A, B = "inverter-a", "inverter-b"
 # ============================================================================ #
 print("1. modes off: byte-identical to 7a00f12 on the trade path")
 # Printed on release/1.0 7a00f12 (2026-09-29), goodwe-addon-checks:1, 1080
-# cycles each; the trade CHARGEs and DISCHARGEs. PRICE-02 (2026-10-22): the
-# digest is `ident.trade_digest()`, which hides two things in the trade
-# sentence: the "above the cheapest" figure (the plan now drops price periods
-# that have ended, so it is another number once the first cheap period is
-# over) and "hour" -> "price period". Re-measured with it on 7a00f12, on
-# release/1.0 90bc901 and on this tree: the same four digests.
+# cycles each; the trade CHARGEs and DISCHARGEs.
+#
+# PRICE-02 (2026-10-22) changed two things in the trade sentence and nothing
+# else: the plan now drops price periods that have ended, so a sale's "N above
+# the cheapest" is another number once the first cheap period is over, and the
+# sentences say "price period" for "hour". So there are three pins:
+#   AT_7A00F12_OLD  the digests printed on 7a00f12, sentence included. They no
+#                   longer match, and the check below says so: that is what
+#                   makes the mask necessary.
+#   AT_7A00F12      the same rows through `ident.trade_digest()`, which hides
+#                   exactly those two things (and only for this comparison with
+#                   an older tree). It equals what 7a00f12 gives through it.
+#   AT_NOW          this tree's own digests, sentence included, with nothing
+#                   hidden: any later change to a command, a sentence or a
+#                   figure moves it. The mask cannot hide a future drift.
+AT_7A00F12_OLD = {
+    "n1": "71245b227ca40bada4f71f57ea6154475f4b0bd60239c9ad4f80bffb0094514c",
+    "n2": "56cf28010b06765c29e5479abb815d7503d570b39240d82dfc818efa90c93722",
+}
 AT_7A00F12 = {
     "n1": "33886ef03f364852883f0370230e6e04823fbb46a4704f88ca75bf9082d98c01",
     "n2": "666a31f41491c22750720524853d95944d5fba395d1d14040c460d71414b275f",
     "n1_off": "33886ef03f364852883f0370230e6e04823fbb46a4704f88ca75bf9082d98c01",
     "n2_off": "666a31f41491c22750720524853d95944d5fba395d1d14040c460d71414b275f",
 }
+AT_NOW = {
+    "n1": "939b3d47bbd64fa50e3d70538f092fb98e5c4bd5ead85a7fc696a1dbb514039e",
+    "n2": "c51008213dd739e1e5142c236d9a950aa585992393e4af120086f1ba52ff3e0d",
+    "n1_off": "939b3d47bbd64fa50e3d70538f092fb98e5c4bd5ead85a7fc696a1dbb514039e",
+    "n2_off": "c51008213dd739e1e5142c236d9a950aa585992393e4af120086f1ba52ff3e0d",
+}
 _cmd_digest = ident.trade_digest
 _rows = {k: ident.run(**ident.SCENARIOS[k])[0] for k in AT_7A00F12}
 _got = {k: _cmd_digest(v) for k, v in _rows.items()}
 for k in AT_7A00F12:
     print(f"    {k} {'same' if _got[k] == AT_7A00F12[k] else 'DIFFERS'} "
           f"{_got[k][:16]}")
+_full = {k: ident.digest(v) for k, v in _rows.items()}
 check("with battery modes off (option absent or false), every command, "
-      "integrator, allocation and trade sentence equals 7a00f12's, at one "
-      "inverter and at two", _got == AT_7A00F12)
+      "integrator, allocation and trade action equals 7a00f12's, at one "
+      "inverter and at two (the sentence masked as above)",
+      _got == AT_7A00F12)
+check("...the mask is needed and nothing more: unmasked, n1 and n2 differ "
+      "from 7a00f12's printed digests, and unmasked they equal this tree's "
+      "own pins, so a later change to any sentence or figure fails here",
+      all(_full[k] != AT_7A00F12_OLD[k] for k in AT_7A00F12_OLD)
+      and _full == AT_NOW)
 _acts = {r[-1][0] for r in _rows["n2"] if r[-1]}
 check("...and the runs reach the trade P3 now skips with modes on: a charge "
       "and a sale", {arbitrage.CHARGE, arbitrage.DISCHARGE} <= _acts)