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>

specs/bishearecha.md

@@ -182,7 +182,12 @@ output is condemned by it. `POST /courtyard/bedikah/pair`. Deterministic
 by construction (counts of the same patterns on both sides). The
 archive's own suggestion — paired probes — is this verse.
 
-**Status.** Not built. The readings exist; the scale does not.
+**Status.** Built (2026-10-07): `POST /courtyard/bedikah/pair`,
+`VavPipeline.Bedikah.Pair`, `halt/mishkal.pl` (`halt_check_even_vaaven/2`),
+L3 `bedikah_pairs`. Seventeen measures; a lean is one against none or at
+least twice as many. Tamid §1.1 has the shape. The mirror itself — the
+same question with the parties exchanged — is still composed by the
+caller; the gate (§I) will compose it.
 
 ## VII. Rebuke, not hatred in the heart — Vayikra 19:17
 
@@ -292,6 +297,7 @@ In the order the text argues it, and by dependency:
 1. **Two witnesses for check 7** (V.b) — smallest change, largest effect
    on precision; no new dependency. *Done 2026-10-07.*
 2. **The paired reading** (VI) — the readings exist; add the scale.
+   *Done 2026-10-07.*
 3. **Rule anchors verified against L1** (X) — the checks grounded.
 4. **The gate** (I), with the fringe (III) and the rebuke (VII) — the
    architecture's centre; the first three make it worth standing at.