feat: mid-session status updates — ticket notes, client updates, email drafts

Engineers can now generate AI-powered status updates during active FlowPilot
sessions and after resolve/escalate. Three audiences (Ticket Notes, Client
Update, Email Draft) with Quick/Detailed length options. Copy to clipboard
with one click. Client names auto-inserted from intake/PSA context.

Backend: new endpoint POST /ai-sessions/{id}/status-update with audience-aware
system prompts. Frontend: StatusUpdateModal with 2-step selection flow,
Share Update button in action bar, Share Resolution/Escalation on completed
sessions. Also updates Solutions Library spec with Community tier design.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/api/endpoints/ai_sessions.py

@@ -36,6 +36,8 @@ from app.schemas.ai_session import (
     SessionCloseResponse,
     SessionDocumentation,
     RateSessionRequest,
+    StatusUpdateRequest,
+    StatusUpdateResponse,
     PickupSessionRequest,
     LinkTicketRequest,
     AISessionSummary,
@@ -733,6 +735,31 @@ async def get_documentation(
         raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail=str(e))
 
 
+# ── Status Update ──
+
+@router.post("/{session_id}/status-update", response_model=StatusUpdateResponse)
+@limiter.limit("20/minute")
+async def create_status_update(
+    request: Request,
+    session_id: UUID,
+    data: StatusUpdateRequest,
+    current_user: Annotated[User, Depends(get_current_active_user)],
+    db: Annotated[AsyncSession, Depends(get_db)],
+):
+    """Generate a status update for ticket notes, client, or email."""
+    try:
+        return await flowpilot_engine.generate_status_update(
+            session_id=session_id,
+            request=data,
+            user_id=current_user.id,
+            db=db,
+        )
+    except ValueError as e:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail=str(e))
+    except PermissionError as e:
+        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail=str(e))
+
+
 # ── Rate ──
 
 @router.post("/{session_id}/rate", status_code=204)