Extract authenticated coulomb.social design language via designlang

Session probe lands on /vw_pages (Research). Use main designlang extract
with --cookie-file — pack ignores auth. 39 artifacts under
docs/design-extract; tolerate designlang late summary crash when cores exist.

docs/design-extract/coulomb-social-voice.json

@@ -0,0 +1,71 @@
+{
+  "tone": "neutral",
+  "pronoun": "third-person",
+  "headingStyle": "unknown",
+  "headingLengthClass": "tight",
+  "ctaVerbs": [
+    {
+      "value": "content",
+      "count": 25
+    },
+    {
+      "value": "favorite",
+      "count": 25
+    },
+    {
+      "value": "format",
+      "count": 1
+    },
+    {
+      "value": "filter",
+      "count": 1
+    },
+    {
+      "value": "add",
+      "count": 1
+    },
+    {
+      "value": "arrow",
+      "count": 1
+    },
+    {
+      "value": "note",
+      "count": 1
+    }
+  ],
+  "buttonPatterns": [
+    {
+      "value": "content_copy",
+      "count": 25
+    },
+    {
+      "value": "favorite_border",
+      "count": 25
+    },
+    {
+      "value": "format_line_spacing",
+      "count": 1
+    },
+    {
+      "value": "filter_list",
+      "count": 1
+    },
+    {
+      "value": "add_circle_outline",
+      "count": 1
+    },
+    {
+      "value": "arrow_drop_down",
+      "count": 1
+    },
+    {
+      "value": "note_alt",
+      "count": 1
+    }
+  ],
+  "sampleHeadings": [],
+  "stats": {
+    "buttons": 55,
+    "headings": 0
+  }
+}