feat(consume): the payload says what of the question it reached, and row 4 reads it

`coverage` carries three lists: the terms the pre-pass read the question as,
the terms no concept in the bundle answers, and the terms no delivered
excerpt answers. Without it a reader holding eight excerpts cannot tell a
bundle that ANSWERED its question from one that merely ranked something --
the two payloads have the same shape.

FACTS, AND NO VERDICT, which is a measurement and not caution. Two readings
were built and both falsified over 81 questions (16 synthetic, 65 across the
three real sets, 2026-09-20): the share of question terms a delivered
excerpt answers separates the synthetic controls at 0.33 against 0.50 and
REVERSES on real data (covered questions down to 0.27, one genuinely
uncovered question at 0.71); the share of a bundle tying the best lexical
match is ~0.00 for every real question either way. Question style dominates
the first, corpus size the second.

The one bar this repository declares is the gate's: `UNANSWERED_BAR = 2/3`
over `unanswered_in_bundle`, swept and collapsing at both ends -- at 0.50
eleven real covered questions are marked, at 0.70 the row falls to 5 of 6,
at 2/3 the row is 6 of 6 and 0 of 65 real questions are marked. The margin
is thin (0.6087 against 0.6667) and is published that way, together with
what it does not catch: r761-sk2's own known-negative sits at 0.2857.

Row 4: 3 of 6 RED -> 6 of 6 GREEN, with the 10 answered synthetic questions
held unmarked as the known-negative. The contract's SS 8 gains point 7, the
consumption skill is told to read the block, and the SS 7.4 known-positive
moves with the document (14 721/375 -> 16 389/417). Suite 2292 passed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/consumption-contract.md

@@ -160,6 +160,11 @@ are permitted; the checker reads only the members this section names.
     "known_positive": { "case": "<name>", "expected": 10406, "measured": 10406 }
   },
   "denominators": { "considered": 439, "withheld": 401, "delivered": 38 },
+  "coverage": {
+    "question_terms": ["<the terms the pre-pass read the question as>"],
+    "unanswered_in_bundle": ["<those no concept in the bundle answers>"],
+    "unanswered_in_payload": ["<those no delivered excerpt answers>"]
+  },
   "excerpts": [
     {
       "bundle_id": "<id>",
@@ -224,6 +229,27 @@ are permitted; the checker reads only the members this section names.
    the enclosing concept's text inside `parent` — `text`, with that concept's
    own `sha256`, and `truncated` where it was cut to fit — and then only from
    the room its cut left, so that inherited text never displaces an excerpt.
+7. A pre-pass SHOULD carry `coverage`: the terms it read the question as, the
+   ones no concept in the bundle answers, and the ones no delivered excerpt
+   answers. Without it a reader holding eight excerpts cannot tell a bundle
+   that answered its question from one that merely ranked something — the two
+   payloads have the same shape — and § 6's states are then unreachable from
+   the payload alone.
+
+   **Facts, and no verdict.** The member carries lists and never a score, a
+   confidence or a "weak" flag, because the two obvious verdicts were built
+   and falsified against 81 questions on 2026-09-20: the share of a question's
+   terms a delivered excerpt answers separates a synthetic corpus at 0.33
+   against 0.50 and then reverses on real data, where covered questions run
+   down to 0.27 while one genuinely uncovered question sits at 0.71; and the
+   share of a bundle tying the best lexical match is ~0.00 for every question
+   in a large bundle, covered or not. Question style dominates the first and
+   corpus size the second, so a pre-pass emitting a verdict would assert
+   across corpora what was measured on one. Where a bar belongs is in the
+   consumer's own judgement or in a gate that publishes its sweep.
+
+   The checker does not read this member, for the same reason: it holds a
+   payload's FORM, and these lists carry no claim a form can be held to.
 
 ## 9. Prohibitions