Wave 5A: /u house-mode public profile (D2)

Reserved house handle (default 'vyndr', env HOUSE_HANDLE) resolves to the
PUBLIC model record — getModelAggregate() with no userId (user_id=NULL rows)
— WITHOUT a public_profiles row. It is the ONLY special case; every other
handle keeps the private-by-default, byte-identical-404 no-existence-leak
contract. The house profile is always public and never 404s (a fetch failure
degrades to an honest building state).

- src/routes/profiles.js: house short-circuit + sendHouseProfile (public
  aggregate + by_tier + public settled entries), reserved before the publish
  lookup so a user claim is shadowed.
- PublicProfile.tsx: house label 'VYNDR MODEL · PUBLIC RECORD' + hero/subtitle
  off data.house; keeps the CLV-VERIFIED record hero + TierRecord calibration
  + recent settled reads (misses included).
- opengraph-image.tsx (1200x630): house-branded eyebrow/heading.
- portrait/route.tsx: new 1080x1350 share crop (real aggregate or tagline
  fallback, never a fabricated number).
- Discoverability: 'VIEW AS PUBLIC PAGE ->' on the ledger MODEL header +
  'VIEW PUBLIC RECORD ->' under the landing ModelRecord, both to /u/vyndr.
- tests/unit/houseProfile.test.js: house resolves to user_id=NULL aggregate
  (no public_profiles row) + by_tier; unknown/unpublished user handles stay
  byte-identical 404; page renders house label + TierRecord + portrait crop.

3019 tests green (3012 -> 3019); next build EXIT=0.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/src/app/page.tsx

@@ -1,6 +1,7 @@
 'use client';
 
 import { useEffect, useState } from 'react';
+import Link from 'next/link';
 import { useRouter } from 'next/navigation';
 import { useAuth } from '@/contexts/AuthContext';
 import Hero from '@/components/Hero';
@@ -85,8 +86,16 @@ export default function Home() {
       {/* Session 58 (work-order 1.4) — the public model record (proof-strip
           footer). Deferred-render: "RECORD BUILDING" until 20 settles, then
           the real hit% + beat-close%. Self-hides with no data. */}
-      <div style={{ padding: '4px 16px 12px' }}>
+      <div style={{ padding: '4px 16px 12px', display: 'flex', flexDirection: 'column', alignItems: 'center', gap: 6 }}>
         <ModelRecord />
+        {/* Wave 5A (D2) — the shareable public model record (the house profile). */}
+        <Link
+          href="/u/vyndr"
+          className="mono"
+          style={{ fontSize: 10.5, fontWeight: 700, letterSpacing: '0.08em', color: 'var(--text-tertiary)', textDecoration: 'none' }}
+        >
+          VIEW PUBLIC RECORD →
+        </Link>
       </div>
       {/* Founder-seat scarcity meter (§12) */}
       <div style={{ padding: '0 16px 8px' }}>