bedikah: two witnesses for check 7 (bishe'arecha step 1)

Devarim 19:15 — one witness does not stand. A frame form now stands only
when it is found in two distinct sentences, or in one sentence beside a
violation from checks 1–6, or beside a sentence of another form; the
Vav Pipeline sends the halt term only then (stands_on: sentences |
other_checks | other_forms, witnesses: n). A form seen once and alone
is returned under checks.frames.noted with its sentence and is not
counted in the verdict; the output is still examined, not empty.

Tamid §1.1 contract and bishearecha.md §V updated; Doorpost re-pinned
(86a43d6b…). Elixir 558/0; Prolog bedikah 34/34 (the rule is unchanged;
its header says what now reaches it).

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

vav_pipeline/lib/vav_pipeline/bigdei_kodesh/router.ex

@@ -604,7 +604,8 @@ defmodule VavPipeline.BigdeiKodesh.Router do
               "could be checked, reaches for nothing it may not touch, does not claim to have checked " <>
               "itself, does not center itself, does not shut out the other side, and takes none of the forms " <>
               "a trained default takes (nothing called contested without a disputant, no self-certification, " <>
-              "no agency moved onto the reader, no Jewish subject in borrowed categories or answered without its own sources)." <> grounding_note
+              "no agency moved onto the reader, no Jewish subject in borrowed categories or answered without its own sources). " <>
+              "A form seen in one sentence alone is noted under checks.frames.noted and not counted: one witness does not stand." <> grounding_note
 
           :lo_tov ->
             "At least one check fired. The violations say which rule, and the checks say what it fired on."