docs: grade-board sort fingerprinted (deploy boundary captured; ladder induced both directions)

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QJs13VsyiSKYQP6rj3NNmc

outputs/VYNDR-COMPLETION-MATRIX.md

@@ -350,6 +350,12 @@ grade-tier-first "top GRADES"; hero = p_win-first "top read"). They agree exactl
 leading tier (verified); across tiers the board may lead with an A the hero doesn't pick. Not a
 contradiction — do not "fix" it by making the board ignore grade.
 
-**Floor:** 310 suites / 3864 tests green, web build exit 0. Dashboard + Desk visuals are auth/feed-gated
-→ tagged for the Chrome audit, no visual faked. **Held:** edge_pct rescale/display retirement, building
+**Floor:** 310 suites / 3864 tests green, web build exit 0. **Post-deploy fingerprint (`b85b351`),
+both halves verified:** the deployed `/dashboard` chunk was polled across the deploy boundary — attempts
+1-3 carried the OLD `Math.abs(...-1/0)` key, attempt 4 flipped to the new comparator with the old one
+GONE (before/after observed, not inferred); API health 200 on snapshot/mlb, snapshot/wnba, accuracy. The
+backend ladder was **induced on demand** on live MLB game logs rather than waiting for a cron slot:
+OVER @0.5 → `0.5•(C) 1(C) 1.5(F)` (line-ASC PASS), UNDER @1.5 → `2.5(C) 2(C) 1.5•(C) 1(C) 0.5(F)`
+(line-DESC PASS). Only the *rendered* Desk card remains unverified anonymously → tagged for the Chrome
+audit, no visual faked. **Held:** edge_pct rescale/display retirement, building
 the missing `/api/props/top-graded` selector, exposing p_win to unentitled tiers.