Land CSOC-WP-0006 PageOps: member space/page CRUD, copy, transfer

Thin CONTENT_ROOT content plane (ADR-0003/0004) with space visual field,
product UI for Title/Abstract/Visual, page list sidebar, and tests. Update
capability model and smoke checklist; mark WP-0006 finished.

coulomb_social/apps/spaces/migrations/0002_space_visual.py

@@ -0,0 +1,27 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("spaces", "0001_initial"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="space",
+            name="visual",
+            field=models.CharField(
+                blank=True,
+                help_text="Cover/visual path relative to space tree (e.g. assets/cover.jpg).",
+                max_length=512,
+            ),
+        ),
+        migrations.AlterField(
+            model_name="space",
+            name="description",
+            field=models.TextField(
+                blank=True,
+                help_text="Short description (product label: Abstractor).",
+            ),
+        ),
+    ]