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/templates/spaces/page_copy.html

@@ -0,0 +1,55 @@
+{% extends "base.html" %}
+{% block title %}Copy page — {{ space.title }} — {{ site_name }}{% endblock %}
+{% block extra_head %}
+<style>
+  select {
+    width: 100%;
+    padding: 0.5rem 0.75rem;
+    margin-top: 0.25rem;
+    border: 1px solid #ccc;
+    border-radius: 6px;
+    font: inherit;
+    background: #fff;
+  }
+  .form-actions {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 0.75rem;
+    margin-top: 1.25rem;
+    align-items: center;
+  }
+</style>
+{% endblock %}
+{% block content %}
+  <p class="muted" style="margin:0 0 0.5rem;">
+    <a href="{% url 'spaces:detail' space.slug %}?page={{ page_slug }}">← {{ space.title }}</a>
+  </p>
+  <h1>Copy page</h1>
+  <p class="muted">
+    Create an independent copy of <strong>{{ page_slug }}</strong>.
+    Relative visual assets are duplicated when present.
+  </p>
+
+  <form method="post" class="card" style="margin-top:1rem;">
+    {% csrf_token %}
+    <label for="id_dest_space">Destination space</label>
+    <select id="id_dest_space" name="dest_space">
+      {% for s in all_spaces %}
+        <option value="{{ s.slug }}" {% if s.slug == space.slug %}selected{% endif %}>{{ s.title }} ({{ s.slug }})</option>
+      {% endfor %}
+    </select>
+
+    <label for="id_dest_slug">New page slug</label>
+    <input type="text" id="id_dest_slug" name="dest_slug" required maxlength="80"
+           value="{{ default_dest }}"
+           pattern="[a-z0-9]+(?:-[a-z0-9]+)*" autocomplete="off">
+
+    <label for="id_title">Title <span class="muted">(optional — defaults to “Original (copy)”)</span></label>
+    <input type="text" id="id_title" name="title" maxlength="255" value="" autocomplete="off">
+
+    <div class="form-actions">
+      <button type="submit" class="btn">Create copy</button>
+      <a class="btn secondary" href="{% url 'spaces:detail' space.slug %}?page={{ page_slug }}">Cancel</a>
+    </div>
+  </form>
+{% endblock %}