Rewrite the shared-item model sweep instead of leaving it a follow-up:
the earlier ModelWithSharedItems copied FireControl.Apply's own
survey-then-walk shape closely enough that reverting production to a
plain sequential per-lane absorb (no pooling at all) still passed it.
FixedPointItemResolution settles items in a different order from
production: it batches every lane's own armour-only walk into full
passes, then checks every currently open pool for readiness once per
whole pass (a dynamic, re-derived-each-time check, not a table built
once up front -- a precomputed-once version deadlocked on a non-convex
item crossed twice by the same lane). Lane geometry is read from the
real FireControl.Lanes instead of a second hand-rolled walk, removing
a class of disagreement that had nothing to do with absorption order.
Durabilities are now drawn below a lane's own share so every shared hit
overflows, hull damage is compared alongside armour and items, and the
tolerance is tightened now that lane geometry can no longer drift.
Also fixes: rejected attempts in the retry loop were mutating real
state without resetting it, corrupting the "before" snapshot; the
model was missing Entity.ItemAbsorb's own pooled .1f threshold.
Reran M0 (control, green) through M4: M1 (forced sequential absorb)
now kills the sweep as well as the mirror/proportional tests.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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