The interface was about to restore the lie: null confidence rendered as 0%

The backend already refuses to state a probability it cannot certify. The card
did not. `gradeAdapter.js:59` read

    input.confidence != null ? Math.round(Number(input.confidence)) : 0

and `GradeResultCard` printed `{d.confidence}% confidence` unconditionally, so
an UNCERTIFIED Read — which by contract carries no exact probability — would
have rendered "0% CONFIDENCE" to a user. That is `Number(null) === 0`, the
standing fabrication bug in this codebase, arriving at the last surface before
the eye.

Found by running two REAL production rows (model_snapshots 453021 and 453033
from proven cohort 27ce152f) through the real serving seam and the real adapter,
before rendering anything.

Repaired at the two places it lives, presentation only:
  - the adapter carries null through instead of coercing;
  - the card renders "Confidence unavailable" as TEXT when there is no number.

Wording follows the house pattern already in `readHistory.js` ("History
unavailable") — no dash, no dimmed zero, no icon-only state, and no engineering
language: a test forbids isotonic / artifact / probability_contract /
UNCERTIFIED / certification_version reaching the card.

A second, narrower correction: the derived-field withdrawal was
`if (f in out) out[f] = null`, so it depended on whether the input happened to
carry the key and a field added by a later merge would have arrived
un-withdrawn. An uncertified row now DECLARES each probability-derived claim
null rather than merely lacking it.

The uncertified fixture is the strong case, not a convenient one: Luis Robert
carries value:true and ev_pct 38.5 on the raw row, so the contract has a live
VALUE badge to withdraw rather than an absent one to leave absent. Verified
withdrawn, while grade B+, the side, the Read and the market (book -160,
fair -135) all survive.

The certified case moves the number materially and visibly: raw 0.798 -> served
0.638, and EV is recomputed from the served probability, not carried from raw.

PriceTriplet needed no change — it already renders an absent leg as a dash and
was documented never to print a zero.

Suite 407/407, 5,691 passed. Teeth 45/45 + 10/10 + 23/23. Live OFF.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CQJeAG8vcDoL5zkiaJyVb8

scripts/teeth-artifact-governance.js

@@ -292,9 +292,12 @@ inject(38, 'live default is not OFF',
   'src/services/model/probabilityContract.js',
   `  const flag = String(raw || '') === '1';`, `  const flag = String(raw ?? '1') !== '0';`,
   'tests/unit/servedProbability.test.js');
-inject(39, 'an uncertified row keeps a probability-derived claim',
+inject(39, 'an uncertified row keeps its exact probability',
   'src/services/model/servedProbability.js',
-  `    for (const f of DERIVED_FIELDS) if (f in out) out[f] = null;`, ``,
+  `    out.p_win = null;
+    out.confidence = null;`,
+  `    out.p_win = row.p_win;
+    out.confidence = row.confidence;`,
   'tests/unit/servedProbability.test.js');
 inject(40, 'a certified row derives EV from raw instead of served',
   'src/services/model/servedProbability.js',
@@ -328,6 +331,31 @@ logic(45, 'the stage promotion changed the artifact', () => {
     detail: `id/knot/curve/cutoff/fit_n unchanged across promotion; stage=${A2.stage}` };
 });
 
+// ── RENDER CONTRACT (this tranche) ───────────────────────────────────────
+inject(46, 'a null confidence is coerced to a number for the card',
+  'web/src/lib/gradeAdapter.js',
+  `  const confidence = input.confidence != null && Number.isFinite(Number(input.confidence))
+    ? Math.round(Number(input.confidence))
+    : null;`,
+  `  const confidence = input.confidence != null ? Math.round(Number(input.confidence)) : 0;`,
+  'tests/unit/liveRenderContract.test.js');
+inject(47, 'the card prints a confidence number unconditionally',
+  'web/src/components/vyndr/GradeResultCard.tsx',
+  `          {d.confidence != null
+            ? <span>{d.confidence}% confidence</span>
+            : <span style={{ color: 'rgba(232,255,244,.55)' }}>Confidence unavailable</span>}`,
+  `          <span>{d.confidence}% confidence</span>`,
+  'tests/unit/liveRenderContract.test.js');
+inject(48, 'an uncertified row keeps its VALUE badge',
+  'src/services/model/servedProbability.js',
+  `    for (const f of DERIVED_FIELDS) out[f] = null;`, ``,
+  'tests/unit/liveRenderContract.test.js');
+inject(49, 'a certified row shows the raw probability as confidence',
+  'src/services/model/servedProbability.js',
+  `      out.confidence = Math.round(resolution.served_probability * 100);`,
+  `      out.confidence = Math.round(resolution.raw_model_probability * 100);`,
+  'tests/unit/liveRenderContract.test.js');
+
 const landed = results.filter((r) => r.landed).length;
 console.log(JSON.stringify({ teeth_landed: `${landed}/${results.length}`, results }, null, 2));
 process.exit(landed === results.length ? 0 : 1);