Wire the composed surface: the honest fields now reach a user

PHASE 0 re-check caught the same failure a THIRD time, mine again. Last
turn I created GradeScaleLegend.tsx and never mounted it, and I reported
that the separation flag "renders per band" -- it did not. grep: zero
frontend references to separates_from_base_rate, served_grade or
factor_adjustment. The honest grade was reaching the API payload and dying
at the adapter boundary.

That is three occurrences in three orders of the same shape: built,
correct, unread. gradeBands, then served_grade, then the legend.

PHASE 2 — the composed surface is wired end to end:
  analyzeViaEngine1 -> served_grade + factor_adjustment on the payload
  scan/page.tsx     -> ScanResponse types them and forwards them
  gradeAdapter      -> gradeMeaning, separatesFromBaseRate,
                       bandRealizedRate, factorsApplied, refusalReason
  GradeResultCard   -> renders "WHAT THIS GRADE MEANS"

What a user now sees that they could not before: what the band has
actually realized, an amber note when the read CANNOT be separated from
the baseline, and -- only where a factor actually fired, with its proven
sign -- what moved the read, in plain language rather than feature names
("where he hits it vs who is standing there").

No narrative on props where nothing fired: factorsApplied is empty and the
block self-hides. Only the three PROVEN hits factors have labels, so an
unproven factor cannot acquire prose by being added to the map.

PHASE 1 — GradeScaleLegend is now MOUNTED on the grade card (compact). The
ceiling is a stated position where the grade is, not a page a user would
have to find.

PHASE 3 hand-verified through the real adapter across twelve states: B+
with 3/0 factors, B with 1, C+/C/C- all flagged not-separable, D, F, a
switch-hitter case where 2 of 3 factors fire, two refusals and a
no-forecast. never-blank PASS, no-manufactured-A PASS, no-narrative-when-
nothing-fired PASS, separation-flag-reaches-card PASS.

No A-threshold loosening. No calibrated number leaks. p_win never mutated.
engine_grade still read by zero serving code. No Bonferroni slot.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01W1sivYNqY2TS5ftykmHBU9

web/src/lib/gradeAdapter.js

@@ -86,6 +86,27 @@ function mapScanToGradeResult(input = {}) {
     side,
     grade: input.grade || '—',
     confidence,
+    // ── THE HONEST GRADE FIELDS ────────────────────────────────────────────
+    // The served grade knows whether its band can actually be separated from
+    // the baseline, and which proven factors (if any) moved the forecast. Both
+    // were being computed and thrown away at this boundary. A grade that cannot
+    // separate must SAY so on the card -- that flag is the honest core, and
+    // carrying it in an object nobody reads is the same as not having it.
+    gradeMeaning: (input.served_grade && input.served_grade.meaning) || null,
+    separatesFromBaseRate: input.served_grade
+      ? input.served_grade.separates_from_base_rate === true : null,
+    bandRealizedRate: (input.served_grade && input.served_grade.band_realized_rate) ?? null,
+    // Only factors that ACTUALLY fired, with their proven sign. No narrative on
+    // props where nothing fired.
+    factorsApplied: (input.factor_adjustment && Array.isArray(input.factor_adjustment.applied))
+      ? input.factor_adjustment.applied.map((a) => ({
+        factor: a.factor,
+        direction: a.multiplier > 1 ? 'up' : 'down',
+        multiplier: a.multiplier,
+      }))
+      : [],
+    refusalReason: (input.served_grade && input.served_grade.state !== 'graded')
+      ? input.served_grade.meaning : null,
     // DATA SEMANTICS (Session 58): projection is MODEL output and must never
     // be fabricated. The old fallback displayed the LINE as the projection —
     // the audit's model==line / +0% edge degenerate. No projection → the