feat: add cockpit frontend types and API methods (Phase 3)

- TriageMeta, EvidenceItem, TriageUpdate interfaces
- QuestionItem.options field for quick-reply buttons
- triage_update on ChatMessageResponse
- Triage fields on AISessionDetail for session resume
- updateTriage() and getHandoffDraft() API methods

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/api/aiSessions.ts

@@ -18,6 +18,7 @@ import type {
   ChatSessionCreateResponse,
   ChatMessageRequest,
   ChatMessageResponse,
+  TriageMeta,
 } from '@/types/ai-session'
 
 export const aiSessionsApi = {
@@ -241,6 +242,26 @@ export const aiSessionsApi = {
     )
     return response.data
   },
+
+  async updateTriage(sessionId: string, fields: Partial<TriageMeta>): Promise<TriageMeta> {
+    const response = await apiClient.patch<TriageMeta>(
+      `/ai-sessions/${sessionId}/triage`,
+      fields
+    )
+    return response.data
+  },
+
+  async getHandoffDraft(sessionId: string): Promise<string> {
+    const response = await apiClient.post<string>(
+      `/ai-sessions/${sessionId}/handoff-draft`,
+      {},
+      { headers: { Accept: 'text/event-stream' }, responseType: 'text' }
+    )
+    // Response is SSE format: "data: {...}\n\n"
+    const raw = typeof response.data === 'string' ? response.data : ''
+    const dataLine = raw.split('\n').find(l => l.startsWith('data: '))
+    return dataLine ? dataLine.slice(6) : raw
+  },
 }
 
 export default aiSessionsApi

frontend/src/types/ai-session.ts

@@ -198,6 +198,11 @@ export interface AISessionDetail extends AISessionSummary {
   pending_task_lane: { questions: QuestionItem[]; actions: ActionItem[] } | null
   is_branching: boolean
   active_branch_id: string | null
+  client_name: string | null
+  asset_name: string | null
+  issue_category: string | null
+  triage_hypothesis: string | null
+  evidence_items: EvidenceItem[] | null
 }
 
 export interface AISessionSearchResult {
@@ -238,6 +243,28 @@ export interface ActionItem {
 export interface QuestionItem {
   text: string
   context?: string
+  options?: string[] | null
+}
+
+export interface EvidenceItem {
+  text: string
+  status: 'confirmed' | 'ruled_out' | 'pending'
+}
+
+export interface TriageMeta {
+  client_name: string | null
+  asset_name: string | null
+  issue_category: string | null
+  triage_hypothesis: string | null
+  evidence_items: EvidenceItem[]
+}
+
+export interface TriageUpdate {
+  client_name?: string | null
+  asset_name?: string | null
+  issue_category?: string | null
+  triage_hypothesis?: string | null
+  evidence_items?: EvidenceItem[] | null
 }
 
 export interface ChatMessageResponse {
@@ -246,6 +273,7 @@ export interface ChatMessageResponse {
   fork?: ForkMetadata | null
   actions?: ActionItem[] | null
   questions?: QuestionItem[] | null
+  triage_update?: TriageUpdate | null
 }
 
 export interface SimilarSession {