gatekeeper invite ports to #id_bud_btn slide-out: drop the inline #id_invite_email form, add bud-invite panel for room owner during gate phase, async POST to invite_gamer w. autocomplete + symmetric buds auto-add + slide-down Brief banner — TDD

- Brief schema (billboard/0007): post FK becomes nullable + new room FK to epic.Room + KIND_GAME_INVITE enum value. to_banner_dict resolves post_url to reverse('epic:gatekeeper', room.id) when post is null and room is set.
  - epic.invite_gamer view refactor:
    • Accepts `recipient` (matches bud-panel field; legacy `invitee_email` still works for full backwards compat).
    • Resolves via apps.billboard.views._resolve_recipient (email if "@" present, else username).
    • RoomInvite stores the resolved User's email (or raw input if unregistered).
    • Auto-adds inviter ↔ recipient to each others' buds (symmetric per Phase 2 spec) when recipient is a registered User.
    • Spawns a Brief w. owner=request.user, kind=GAME_INVITE, room=room, post=null.
    • Accept: application/json → {brief, recipient_display}; otherwise redirects to gatekeeper as before.
    • Self-invite + blank recipient: 200 w. brief=null, no RoomInvite, no buds touch.
  - _gatekeeper.html: gate-invite-panel block (lines 62-71) removed.
  - new templates/apps/billboard/_partials/_bud_invite_panel.html: clone of _bud_panel.html w. data-invite-url + autocomplete from request.user.buds. JS posts to invite_gamer + Brief.showBanner. room.html includes it owner-only when not table_status and gate_status != RENEWAL_DUE.
  - room.html scripts block now loads apps/dashboard/note.js so window.Brief is defined for the slide-down banner.
  - Tests: new test_invite_gamer.py (14 ITs) covering ajax + legacy form-submit paths, recipient resolution, RoomInvite creation, Brief w. room FK + GAME_INVITE kind, symmetric buds auto-add, unregistered/self/blank silent no-op cases. New test_gatekeeper_bud_btn.py FT (9 tests) covers presence (owner-only), absence of legacy #id_invite_email, async invite flow end-to-end (RoomInvite, Brief, banner, panel close, username resolve, buds auto-add).
  - test_brief.test_brief_owner_post_required relaxed to test_brief_owner_required (post is now nullable).
  - test_room_gatekeeper.test_second_gamer_drops_token_into_open_slot updated to drive the bud-btn flow (drops the #id_invite_email/#id_invite_btn references).
  - 866 ITs (+14) + 9 gatekeeper FTs + 28 existing room-gatekeeper FTs green.

Code architected by Disco DeDisco <discodedisco@outlook.com>
Git commit message Co-Authored-By:
Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/templates/apps/gameboard/_partials/_gatekeeper.html

@@ -59,16 +59,9 @@
                 </div>
             </div>
 
-            {% if request.user == room.owner %}
-                <div class="gate-invite-panel">
-                    <h3>Invite Friend</h3>
-                    <form method="POST" action="{% url 'epic:invite_gamer' room.id %}" style="display:flex; gap:0.5rem; align-items:center;">
-                        {% csrf_token %}
-                        <input type="email" name="invitee_email" id="id_invite_email" class="form-control form-control-lg" placeholder="friend@example.com" style="flex:1; min-width:0;" hx-preserve>
-                        <button type="submit" id="id_invite_btn" class="btn btn-confirm">OK</button>
-                    </form>
-                </div>
-            {% endif %}
+            {# Legacy gate-invite-panel retired in favour of #id_bud_btn at  #}
+            {# the upper-right of the footer (room.html includes the bud    #}
+            {# invite panel partial when the viewer owns the room).         #}
 
         </div>
     </div>

src/templates/apps/gameboard/room.html

@@ -92,6 +92,12 @@
         {% endif %}
         {% if not room.table_status and room.gate_status != "RENEWAL_DUE" %}
             {% include "apps/gameboard/_partials/_gatekeeper.html" %}
+            {# Owner-only invite affordance: handshake btn at the upper-right #}
+            {# of the right sidebar w. slide-out + autocomplete. Replaces the #}
+            {# legacy inline `<form action="invite_gamer">` panel.            #}
+            {% if request.user == room.owner %}
+                {% include "apps/billboard/_partials/_bud_invite_panel.html" %}
+            {% endif %}
         {% endif %}
         {% if room.table_status %}
         <div id="id_tray_wrap"{% if room.table_status == "ROLE_SELECT" and starter_roles|length < 6 %} class="role-select-phase"{% endif %}>
@@ -117,6 +123,9 @@
 {% endblock content %}
 
 {% block scripts %}
+    {# Brief module — needed by _bud_invite_panel's OK handler so the     #}
+    {# slide-down banner shows up on a successful gatekeeper invite.      #}
+    <script src="{% static 'apps/dashboard/note.js' %}"></script>
     <script src="{% static 'apps/epic/room.js' %}"></script>
     <script src="{% static 'apps/epic/gatekeeper.js' %}"></script>
     <script src="{% static 'apps/epic/role-select.js' %}"></script>