Content studio API + preview page; widen the reachability guard; correct

two inventory errors

INVENTORY CORRECTION, and it was mine. Phase 2's two "orphans" are NOT
orphans -- my board grepped only web/src/app and missed component-level
mounting. The transitive check says both are already mounted:

  BookComparisonPanel -> GradeResultCard -> app/scan/page.tsx
  NewsWire            -> ExploreHub      -> app/explore/page.tsx

So book comparison is DONE (wired to /api/books, rendering on the grade
card) and THE WIRE is DONE-BY-DESIGN, mounted in ExploreHub. Its header
names an "Offseason Hub" as its home, and that hub genuinely does not
exist -- but that is board item #8, not a mounting bug, and inventing a
surface to satisfy a comment would be the wrong fix.

The lesson is the same one this session keeps teaching: I checked one
directory and reported a conclusion the check could not support.

ALSO CAUGHT: I overwrote src/routes/content.js, which was the Session-29
content-templates route, by picking a filename without looking. Restored
from git with no work lost; the new surface lives at
/api/content-studio and both now coexist.

PHASE 0/1 — /api/content-studio serves finished posts (copy, branded card,
card_svg, the fact_contract each was REQUIRED to have, and the facts that
actually backed it) plus a POST for editorial status in Redis. Private via
internal key; the Next proxy holds the key server-side so the browser
never does. /studio renders it as a thin client -- copy and card side by
side with the fact contract visible, because reviewing copy by reading it
is exactly how a wrong number ships. Never-blank: a night with nothing
generated says so.

API-FIRST is the point: the endpoint an autonomous poster will call is the
one the page already renders, so the agent handoff is a pointer change,
not a rebuild. Contract documented at docs/CONTENT-STUDIO-API.md.

EXPRESS 5 BROKE 23 SUITES at first: `router.get('/:date?')` throws at
mount time in Express 5, taking down everything that imports app.js. Two
explicit routes instead.

PHASE 3 — the reachability guard is widened from grade-fields-only to a
general built-but-unread check. Book comparison, THE WIRE and the content
studio are now registered surfaces; a page counts as its own entry point
(Next mounts it by convention) while everything else must trace to one.
22 checks green; a registered-but-unimported surface still goes red.

FULLY ISOLATED: read-only on model/slate/ledger, serving fingerprint
verified unchanged, accrual clock unchanged at 0 eligible dates.

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

tests/unit/renderReachability.test.js

@@ -69,6 +69,20 @@ const CONTRACT = [
   { promise: 'the ceiling stance / grade scale legend',
     payload: null, backend: 'src/services/model/servedGrade.js',
     adapter: null, component: 'web/src/components/vyndr/GradeScaleLegend.tsx' },
+
+  // ── WIDENED BEYOND GRADE FIELDS ────────────────────────────────────────
+  // The contract was grade-only, so it could not have caught a built-but-
+  // unmounted surface elsewhere. Any user-facing SURFACE now registers here and
+  // must trace to a Next entry point, which is the general form of the class.
+  { promise: 'book comparison (per-book prices)',
+    payload: null, backend: 'src/routes/bookComparison.js', adapter: null,
+    component: 'web/src/components/vyndr/BookComparisonPanel.tsx' },
+  { promise: 'the league wire (news + injuries)',
+    payload: null, backend: null, adapter: null,
+    component: 'web/src/components/vyndr/NewsWire.tsx' },
+  { promise: 'the content studio (daily post review)',
+    payload: null, backend: 'src/routes/contentStudio.js', adapter: null,
+    component: 'web/src/app/studio/page.tsx' },
 ];
 
 const read = (rel) => {
@@ -152,6 +166,12 @@ describe('every promised honest field reaches a rendered pixel', () => {
   );
 
   it.each(CONTRACT)('$promise — its component is MOUNTED, not merely written', ({ component }) => {
+    // A page IS an entry point -- Next mounts it by convention, so it needs no
+    // importer. Everything else must be reachable FROM one.
+    if (isEntry(component)) {
+      expect(fs.existsSync(path.join(ROOT, component))).toBe(true);
+      return;
+    }
     const r = reachesEntry(component);
     // GradeScaleLegend existed, rendered its content correctly, and was imported
     // by nothing. That is what this catches.