feat: add fundamentals parity reporting

frontend/src/dev/harness.tsx

@@ -23,11 +23,13 @@ function dateFromToday(days: number): string {
 }
 
 function metric(key: string, value: number | null, hist: (number | null)[],
-                industry: MetricItem['industry'] = null): MetricItem {
+                industry: MetricItem['industry'] = null,
+                caveat: string | null = null): MetricItem {
   return {
     key: key as MetricItem['key'], value,
     history: hist.map((v, i) => h(P[i], v)),
-    industry, period_end: '2026-03-28', filed_date: '2026-05-01', source: 'sec',
+    industry, period_end: '2026-03-28', filed_date: '2026-05-01', caveat,
+    source: 'sec',
   };
 }
 const ind = (median: number, favorable_percentile: number) =>
@@ -78,12 +80,24 @@ const partial: FundamentalResponse = {
   earnings: { next: { date: dateFromToday(0), session: 'unknown', days_until: 0 }, recent: [] },
   metrics: [
     metric('revenue_growth_yoy', 12, [null, 8, 10, 12], null),
-    metric('eps_growth_yoy', null, [null, null, null, null], null),
+    metric(
+      'eps_growth_yoy',
+      null,
+      [null, null, null, null],
+      null,
+      'Not comparable: share count changed at least 25%; possible split or corporate action.',
+    ),
     metric('operating_margin', 25, [24, 24, 25, 25], null),
     metric('fcf_margin', null, [null, null, null, null], null),
     metric('net_debt', null, [], null),
     metric('net_debt_to_ebitda', 1.9, [1.7, 1.8, 1.9, 1.9], null),
-    metric('share_count_change_yoy', 2.1, [1.8, 2.0, 2.0, 2.1], null),
+    metric(
+      'share_count_change_yoy',
+      null,
+      [1.8, 2.0, 2.0, null],
+      null,
+      'Not comparable: share count changed at least 25%; possible split or corporate action.',
+    ),
   ],
   valuation: {
     pe: 15.2, fcf_yield: null, market_cap_est: 5.4e8,