specs: sugya — the case behind each threshold

The reader from outside: "the form is recognizable as wisdom; the
binah behind it is asserted" — every rule should carry the case it was
derived from and the dissent, and the two-witness rule's exception for
forged_fringe should say why a single witness stands there.

Read from Torah, not from the code: Torah establishes a matter three
ways, by what kind of thing it is. A DEED by witnesses, never one
(Devarim 19:15 — and the verse states its scope: any iniquity, any sin,
any sin one sins; Bamidbar 35:30; Devarim 17:6). A MARK by inspection:
the kohen sees and declares, and a doubtful mark gets a second look,
not a second witness (Vayikra 13:3, 13:5, 22:20; the system's own verb,
lo yevaker hakohen 13:36, bikoret tihyeh 19:20). A WORD by what follows
it, and the crime is presumption, b'zadon (Devarim 18:21–22). The
judges are told to hear the small as the great, not to lean after the
many, to name both the righteous and the guilty, and to keep far from
condemning the innocent (Devarim 1:17; Shemot 23:2, 23:7; Devarim
25:1). The Mishnah (Eduyot 1:5–6, in the second scroll) gives the two
reasons to record the opinion that lost: to rely on it later, and to
locate the one who says "thus I received".

Applied: what the Korban Processor finds IN the text is a mark — seen
once, declared (checks 1, 3–6, and the eighth form, the forged fringe:
kol asher bo mum). What a MODEL DOES is a deed — a habit, recurrence —
and the seven forms of lo_taaseh_lekha are charged as deeds: two
witnesses or one beside another. What a claim RESTS ON is a word,
tested against what was given; the hedged claim is not in the verse.
That table is the cited reason the engine already behaves as it does.

§III gives every anchored rule its case (tablet or specimen class),
its dissent (the reading that acquits, with its verse, and when it
loses), and its exceptions. §IV encodes them: halt/sugya.pl with
kind/3, precedent/3, dissent/3,4, exception/3; verified at startup like
the anchors (SUGYA_MISSING); `sugya` on the verdict with `applied` on
the dissent that held; the constants (@single_witness_forms, the hedged
exemption) read from the facts so behaviour and reason cannot drift;
nothing added to the L3 record; the bedikah must not learn. §V the
build order.

Registered in Doorpost @spec_files (30 files; pin → 7adf0a5d…), AGENTS
spec table, README tree. Elixir 642/0 (doorpost_test on the new pin).

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

README.md

@@ -175,6 +175,7 @@ bikoret/
 │   ├── bikoret_tamid.md             # Tamid — operations, the continual service
 │   ├── bikoret_pekudei.md           # Pekudei — economic model, the accounts
 │   ├── structure_not_content.md       # What the system IS, not what it knows
+│   ├── sugya.md                       # The case behind each threshold — deed, mark, word; the dissent recorded
 │   ├── eish_zarah_reading.md          # The five faces of strange fire
 │   ├── lo_taaseh_lekha.md             # The anti-override boundary
 │   └── broken_tablets/                # The first tablets, preserved