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/schemas/ai_session.py

@@ -137,6 +137,38 @@ class SessionCloseResponse(BaseModel):
     member_mapping_warning: str | None = None
 
 
+class StatusUpdateRequest(BaseModel):
+    """Generate a mid-session or post-session status update."""
+    audience: str = Field(
+        ...,
+        pattern="^(ticket_notes|client_update|email_draft)$",
+        description="Who is this update for?",
+    )
+    length: str = Field(
+        "detailed",
+        pattern="^(quick|detailed)$",
+        description="Quick (1-2 sentences) or detailed breakdown",
+    )
+    context: str = Field(
+        "status",
+        pattern="^(status|resolution|escalation)$",
+        description="What type of communication: mid-session status, resolution close-out, or escalation handoff",
+    )
+
+
+class StatusUpdateResponse(BaseModel):
+    """Generated status update content."""
+    content: str
+    audience: str
+    length: str
+    context: str
+    session_status: str
+    steps_completed: int
+    time_spent_display: str | None = None
+    client_name: str | None = None
+    generated_at: datetime
+
+
 class RateSessionRequest(BaseModel):
     """Submit post-session rating."""
     rating: int = Field(..., ge=1, le=5)