chore: track .vscode/ IDE workspace recommendations

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: bakerboy448

.vscode/extensions.json

@@ -0,0 +1,8 @@
+{
+  "recommendations": [
+    "davidanson.vscode-markdownlint",
+    "eamodio.gitlens",
+    "editorconfig.editorconfig",
+    "yzhang.markdown-all-in-one"
+  ]
+}