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_form.html

@@ -0,0 +1,70 @@
+{% extends "base.html" %}
+{% block title %}{{ form_title }} — {{ space.title }} — {{ site_name }}{% endblock %}
+{% block extra_head %}
+<style>
+  textarea {
+    width: 100%;
+    padding: 0.5rem 0.75rem;
+    margin-top: 0.25rem;
+    border: 1px solid #ccc;
+    border-radius: 6px;
+    font: inherit;
+  }
+  textarea.body-editor {
+    min-height: 16rem;
+    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
+    font-size: 0.9rem;
+    line-height: 1.45;
+  }
+  .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 %}{% if doc.slug and doc.slug != 'index' and not is_new %}?page={{ doc.slug }}{% endif %}">← {{ space.title }}</a>
+  </p>
+  <h1>{{ form_title }}</h1>
+  <p class="muted">Markdown body is the source of truth. Title, Abstract, and Visual are stored in frontmatter.</p>
+
+  <form method="post" class="card" style="margin-top:1rem;">
+    {% csrf_token %}
+    <label for="id_title">Title</label>
+    <input type="text" id="id_title" name="title" maxlength="255"
+           value="{{ doc.title }}" autocomplete="off"
+           placeholder="Page title">
+
+    <label for="id_slug">Slug {% if doc.slug == 'index' %}<span class="muted">(space index — fixed)</span>{% endif %}</label>
+    {% if doc.slug == 'index' %}
+      <input type="text" id="id_slug" name="slug" value="index" readonly maxlength="80">
+    {% else %}
+      <input type="text" id="id_slug" name="slug" maxlength="80"
+             value="{{ doc.slug }}"
+             pattern="[a-z0-9]+(?:-[a-z0-9]+)*"
+             placeholder="page-slug" autocomplete="off"
+             {% if is_new %}required{% endif %}>
+    {% endif %}
+
+    <label for="id_abstractor">Abstract</label>
+    <textarea id="id_abstractor" name="abstractor" rows="2"
+              placeholder="Short abstract">{{ doc.abstractor }}</textarea>
+
+    <label for="id_visual">Visual</label>
+    <input type="text" id="id_visual" name="visual" maxlength="512"
+           value="{{ doc.visual }}"
+           placeholder="assets/page-cover.jpg" autocomplete="off">
+
+    <label for="id_body">Body (markdown)</label>
+    <textarea id="id_body" name="body" class="body-editor" rows="18">{{ doc.body }}</textarea>
+
+    <div class="form-actions">
+      <button type="submit" class="btn">{% if is_new %}Create page{% else %}Save page{% endif %}</button>
+      <a class="btn secondary" href="{% url 'spaces:detail' space.slug %}">Cancel</a>
+    </div>
+  </form>
+{% endblock %}