bedikah: the paired reading — one weight, one measure (bishe'arecha step 2)

Devarim 25:13–16 even va'aven; Vayikra 19:15; Shemot 23:2. Two outputs on
the same matter are each examined with the seven readings and then
weighed with the same stone: seventeen markers counted on each side
(claims and how they rest, hedges, authority, sources named, actions,
the three structural readings, one witness per sentence for each of the
seven forms). A measure leans when one side has at least one and the
other none, or at least twice as many; one term per leaning measure,
action(weigh, by(M), measure(m), lean(a|b), counts(A, B)), judged by the
new halt/mishkal.pl (halt_check_even_vaaven/2). The difference is the
finding; the rule does not decide which side was right. Consensus is not
a measure.

POST /courtyard/bedikah/pair {model, a: {output, query, sources}, b: {...}}
→ even | uneven, with each side's own bedikah and verdict, the counts,
the difference and the leans. Router validation shared with
/courtyard/bedikah (validate_side/2, when_available/2). Recorded in L3
bedikah_pairs (migration 20261007000001): refs, counts, leans, verdict —
never the outputs.

Tamid §1.1 contract, vayakhel §3.9 note, bishearecha §VI marked built.
Doorpost f90870d4…. Elixir 568/0 (+L3 8/0), Prolog bedikah 39/39.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

talmudic_engine/src/interface/api.pl

@@ -23,6 +23,7 @@
 :- use_module('../halt/gilui_arayot').
 :- use_module('../halt/structure').
 :- use_module('../halt/lo_taaseh_lekha').
+:- use_module('../halt/mishkal').
 
 %% ============================================================
 %% REQUEST PROCESSING
@@ -101,6 +102,7 @@ format_halt_check(Action, Response) :-
             ;   halt_check_carrier_centered(Action, Halt)
             ;   halt_check_chelbenah(Action, Halt)
             ;   halt_check_lo_taaseh_lekha(Action, Halt)
+            ;   halt_check_even_vaaven(Action, Halt)
             ),
             Halts),
     (   Halts = []