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/models.py

@@ -1,4 +1,4 @@
-"""Space metadata — content bodies live in Forgejo (markdown), not here."""
+"""Space metadata index — page bodies live on the content plane (markdown)."""
 
 from __future__ import annotations
 
@@ -23,15 +23,24 @@ def validate_space_slug(value: str) -> None:
 class Space(models.Model):
     """Tenant-scoped co-creation space.
 
-    Postgres holds metadata and Forgejo binding pointers only. Long-form pages
-    are markdown in the bound repository (ADR-0002).
+    Postgres holds metadata and optional Forgejo binding pointers. Long-form
+    pages are markdown under CONTENT_ROOT (ADR-0003 / ADR-0004); Forgejo is an
+    optional read/edit fallback (ADR-0002).
     """
 
     id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
     tenant_id = models.CharField(max_length=64, db_index=True)
     slug = models.SlugField(max_length=80, validators=[validate_space_slug])
     title = models.CharField(max_length=255)
-    description = models.TextField(blank=True)
+    description = models.TextField(
+        blank=True,
+        help_text="Short description (product label: Abstractor).",
+    )
+    visual = models.CharField(
+        max_length=512,
+        blank=True,
+        help_text="Cover/visual path relative to space tree (e.g. assets/cover.jpg).",
+    )
     created_by = models.ForeignKey(
         "members.Member",
         on_delete=models.PROTECT,
@@ -80,6 +89,15 @@ class Space(models.Model):
     def has_content_binding(self) -> bool:
         return bool(self.forgejo_owner and self.forgejo_repo)
 
+    @property
+    def abstractor(self) -> str:
+        """Product name for the short description field."""
+        return self.description
+
+    @abstractor.setter
+    def abstractor(self, value: str) -> None:
+        self.description = value or ""
+
     @classmethod
     def suggest_slug(cls, title: str) -> str:
         return slugify(title)[:80] or "space"