OPT-09: the weights parameter nothing ever passed, and what it cannot do

`allocator.plan()` has taken a `weights` argument since ALLOC-01 and NOTHING
had ever passed one - main.py called `resolve()` without it and the arbiter
defaulted it to 1.0 per unit - so the site target was split 50/50 regardless
of what either pack could do. Two things now feed it, and they are different
kinds of thing:

  * a `pack` UNIT claim at P_SAFETY that CLOSES a unit's envelope at its own
    `bms_soc_floor` or at 100 % - a PERMISSION, obeyed absolutely, so an empty
    pack is not asked to discharge and its share goes to the sibling;
  * SoC-aware weights by ENERGY headroom in kWh - a PREFERENCE, which
    `_fill()`'s last-resort pass will override the moment the sibling saturates.

Measured (test_packshare.py part 8): at a load one pack cannot cover, the
weighted arm and the shipped arm command the IDENTICAL watts into an empty pack
and deliver the IDENTICAL watts. Only the envelope stops the ask, and what it
buys is not delivery - it is a reported `unmet_w` where the record used to read
impeccable. Weights are a comfort choice for STABILITY and NOT for DELIVERY.

Also: an optional per-entry `capacity_kwh` (schema change, all-or-nothing across
the roster, rule 9 refuses a partial one); per-pack arbitrage sizing, with the
sell side's no-op stated rather than hidden; and a 0 W trade refused by name,
because a 0 W arbitrage claim is a park order that outranks the loop.

SAFETY-42 and this card meet at one hazard from opposite sides - OPT-09 stops
the site ASKING a pack whose SoC says it cannot deliver, SAFETY-42 alarms when a
pack that said it could does not - and its end-to-end fixture moved as a result.
Its finding is unchanged and is now stated on the two quantities its rejected
discriminator actually reads.

Not filed at all at a roster of one: at N=1 every source routes to the site, so
the interval would bound the SITE TARGET, and SAFETY-25's decided Option A
stands untouched on the live install.

⚠️ INVERTER B DOES NOT EXIST. Its 4600 W / 20.48 kWh / 10 % are FROM DATASHEET
AND SERIAL, and `sim/plantsim.py`'s INVERTER_B is inverter A copied
(`measured=False`), so every two-inverter figure here is arithmetic or two
copies of A. No hardware was touched.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BwRLw7eKYj2byVdwB6kbjU

goodwe_controller/test_inverter.py

@@ -1529,14 +1529,23 @@ check("...and the schema half declares it as a LIST OF OBJECTS whose `name`, "
       "⚠️ SAFETY-32 ADDED THE FOURTH ONE AS REQUIRED RATHER THAN AS "
       "`int(0,50)?`, and the difference is the whole of that card: an optional "
       "per-pack cut-out is a DEFAULTED one, and a default is one number for "
-      "two batteries - the shallower pack protected by the deeper pack's BMS",
+      "two batteries - the shallower pack protected by the deeper pack's BMS. "
+      "⚠️ OPT-09 ADDED `capacity_kwh` AND MADE THE OPPOSITE CHOICE ON PURPOSE: "
+      "it is OPTIONAL (`float(0.1,200)?`) because an absent capacity has an "
+      "honest answer - the add-on then has no opinion about the SPLIT and every "
+      "unit weighs 1.0, which is exactly what shipped - where an absent cut-out "
+      "would have to be invented. If you are here because you added a REQUIRED "
+      "key, read `Inverter.__init__` before changing this line: a required key "
+      "refuses every options blob written before it existed",
       set(_decl9) == {"name", "setpoint_entity", "max_w", "bms_soc_floor",
-                      "soc_entity", "batt_entity", "batt_invert"}
+                      "soc_entity", "batt_entity", "batt_invert",
+                      "capacity_kwh"}
       and not any(_decl9[k].endswith("?")
                   for k in ("name", "setpoint_entity", "max_w",
                             "bms_soc_floor"))
       and all(_decl9[k].endswith("?")
-              for k in ("soc_entity", "batt_entity", "batt_invert")))
+              for k in ("soc_entity", "batt_entity", "batt_invert",
+                        "capacity_kwh")))
 
 # ⚠️ NOTHING IS INHERITED, AND THIS IS DEV-02 RESTATED AS A CONFIG RULE.
 # ⚠️ THE FLAT KEYS ARE SET TO REAL ENTITIES HERE, AND THAT IS THE WHOLE CHECK.