feat(linkedin): migrate render scripts + fonts into plugin (S1)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

plugins/linkedin-thought-leadership/render/__tests__/weasyprint-degradation.test.mjs

@@ -0,0 +1,36 @@
+import { describe, test } from 'node:test';
+import assert from 'node:assert/strict';
+import { resolveWeasyprint as resolvePdf } from '../build-pdf.mjs';
+import { resolveWeasyprint as resolveCarousel } from '../build-carousel.mjs';
+
+// S1 (correction #3): when weasyprint is not resolvable on PATH, the degradation
+// helper must return a skip-signal (NOT throw) and emit an install hint, so the
+// render scripts can skip the PDF step gracefully instead of crashing.
+
+for (const [name, resolveWeasyprint] of [
+  ['build-pdf', resolvePdf],
+  ['build-carousel', resolveCarousel],
+]) {
+  describe(`resolveWeasyprint — ${name}`, () => {
+    test('returns a skip-signal (not a throw) when weasyprint is absent', () => {
+      let result;
+      assert.doesNotThrow(() => {
+        result = resolveWeasyprint(() => false);
+      });
+      assert.equal(result.available, false);
+    });
+
+    test('emits an install hint when absent', () => {
+      const result = resolveWeasyprint(() => false);
+      assert.ok(typeof result.hint === 'string' && result.hint.length > 0);
+      assert.match(result.hint, /weasyprint/i);
+      assert.match(result.hint, /install/i);
+    });
+
+    test('reports available when the probe succeeds', () => {
+      const result = resolveWeasyprint(() => true);
+      assert.equal(result.available, true);
+      assert.equal(result.hint, undefined);
+    });
+  });
+}