Item 8 fix: articles live in web/content (the runtime content root), orphan deleted

The blog showed "Posts coming soon" live: the app reads process.cwd()/content
= web/content at runtime (that's where the old orphan lived and rendered), but
the 5 articles were committed to REPO-ROOT content/articles — which the
deployed app never reads. Moved them to web/content/articles (verified
getAllPosts finds all 5 from cwd=web) and deleted the orphan file
web/content/blog/line-movement-guide.mdx (the route already 301s). Test paths
updated to web/content/articles.

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

tests/unit/compliancePages.test.js

@@ -152,11 +152,11 @@ describe('S2 — compliance footer (global)', () => {
 
 describe('S2 — seed articles + Ghost runbook', () => {
   const ARTICLES = [
-    'content/articles/how-vyndr-grades-a-prop.md',
-    'content/articles/the-vyndr-originals.md',
-    'content/articles/why-our-misses-are-public.md',
-    'content/articles/what-clv-is.md',
-    'content/articles/how-streaks-lie.md',
+    'web/content/articles/how-vyndr-grades-a-prop.md',
+    'web/content/articles/the-vyndr-originals.md',
+    'web/content/articles/why-our-misses-are-public.md',
+    'web/content/articles/what-clv-is.md',
+    'web/content/articles/how-streaks-lie.md',
   ];
 
   // Truth-Everywhere Part 2 (item 8) — these 5 are now PUBLISHED to /blog with