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/test/bedikah_test.pl

@@ -227,4 +227,34 @@ test(the_old_type_source_target_form_still_works) :-
           Status, []),
     Status == "ok".
 
+%% --- The paired reading: one weight (mishkal.pl, bishearecha.md §VI) ---
+
+test(an_uneven_measure_is_two_stones_in_one_bag) :-
+    check('{"action":"halt_check","term":"action(weigh, by(gpt), measure(hedged_claims), lean(a), counts(3, 0))"}',
+          Status, [V]),
+    Status == "halt",
+    sub_string(V, _, _, _, "even_vaaven"),
+    sub_string(V, _, _, _, "hedged_claims").
+
+test(an_unknown_measure_is_not_weighed) :-
+    check('{"action":"halt_check","term":"action(weigh, by(gpt), measure(agreeing_scholars), lean(a), counts(5, 0))"}',
+          Status, []),
+    Status == "ok".
+
+test(equal_counts_do_not_lean) :-
+    check('{"action":"halt_check","term":"action(weigh, by(gpt), measure(claims), lean(a), counts(2, 2))"}',
+          Status, []),
+    Status == "ok".
+
+test(torah_is_not_weighed) :-
+    check('{"action":"halt_check","term":"action(weigh, by(torah), measure(claims), lean(a), counts(2, 0))"}',
+          Status, []),
+    Status == "ok".
+
+test(a_weigh_term_does_not_also_trip_the_other_rules) :-
+    check('{"action":"halt_check","term":"action(weigh, by(claude), measure(source_asymmetry), lean(b), counts(0, 2))"}',
+          Status, Vs),
+    Status == "halt",
+    length(Vs, 1).
+
 :- end_tests(bedikah_bridge).