Two tightenings, each measured by a detached-mutation run:
(1) The validator now blocks a claim above the CBC nominal feasible, in ADDITION
to the P90 stage. Neither dominates the other: an upward-skewed assumption band
lifts P90 ABOVE nominal -- so P90 alone passed review counterexample #1 (claim
100k, nominal 90k, band [0.70, 1.40], measured P90 121057) -- while a
downward-skewed band pushes P90 below it. Independent gate, same Rejection type,
existing rejections keep their existing reason.
(2) An assumption band must enclose its item's unit_cost (low <= unit_cost <=
high, inclusive). A band that misses it states a different price rather than an
uncertainty, and every Monte Carlo draw would then sample away from the item's
stated cost. Checked exactly where the Monte Carlo looks bands up -- per affected
item, by code; a band keyed to no affected item is never sampled and so has no
unit_cost to enclose.
The premise was re-verified against ground truth before building on it, not
taken from STATE: 05.2 unit_cost 215 in (200,230), 03.1 310 in (290,330),
ENERGI-TOTAL-EL 1.0 in [0.70,1.40] and (0.8,1.2). No fixture violates it.
The LLM path already catches ValidationError as a meter-bounded retry
(generate.py:138), so the new invariant cannot crash a run.
Mutations, all RED: detach the nominal block; drop the model_validator
decorator; make the enclosure strict. tests/test_bygg_energi_mikro.py and the
commons golden are UNCHANGED and green -- the regression proof.
586 -> 589 tests.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017DDXwUqHVAQQeYE7X1TXy5
