Add LLM Council mode for multi-model consensus

3-stage council orchestration: parallel model queries (Stage 1),
anonymous peer ranking (Stage 2), and streamed chairman synthesis
(Stage 3). Includes scope-aware file resolution for Google/Claude
providers so upstream file attachments are visible to all providers.

- Backend: council.py orchestrator, /api/run_council_stream endpoint,
  query_model_full() non-streaming wrapper, resolve_provider() helper,
  resolve_scoped_file_ids() for Google/Claude scope parity with OpenAI
- Frontend: council toggle UI, model checkbox selector, chairman picker,
  SSE event parsing, tabbed Stage 1/2/3 response display
- Canvas: amber council node indicator with Users icon

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

1 files changed, 22 insertions, 6 deletions

diff --git a/frontend/src/store/flowStore.ts b/frontend/src/store/flowStore.ts
index 3590580..944b846 100644
--- a/frontend/src/store/flowStore.ts
+++ b/frontend/src/store/flowStore.ts
@@ -73,6 +73,16 @@ export interface MergedTrace {
   summarizedContent?: string; // For summary strategy, stores the LLM-generated summary
 }
 
+export interface CouncilData {
+  stage1: Array<{ model: string; response: string }> | null;
+  stage2: {
+    rankings: Array<{ model: string; ranking: string; parsed_ranking: string[] }>;
+    label_to_model: Record<string, string>;
+    aggregate_rankings: Array<{ model: string; average_rank: number; rankings_count: number }>;
+  } | null;
+  stage3: { model: string; response: string } | null;
+}
+
 export interface NodeData {
   label: string;
   model: string;
@@ -85,22 +95,28 @@ export interface NodeData {
   reasoningEffort: 'low' | 'medium' | 'high';  // For OpenAI reasoning models
   attachedFileIds?: string[]; // IDs of files attached to this node
   disabled?: boolean;  // Greyed out, no interaction
-  
+
+  // Council mode
+  councilMode?: boolean;
+  councilModels?: string[];
+  chairmanModel?: string;
+  councilData?: CouncilData;
+
   // Traces logic
   traces: Trace[];          // INCOMING Traces
   outgoingTraces: Trace[];  // ALL Outgoing (inherited + self + forks + merged)
   forkedTraces: Trace[];    // Manually created forks from "New" handle
   mergedTraces: MergedTrace[];  // Merged traces from multiple inputs
-  activeTraceIds: string[]; 
-  
-  response: string;    
+  activeTraceIds: string[];
+
+  response: string;
   status: NodeStatus;
   inputs: number;
-  
+
   // Timestamps for merge logic
   querySentAt?: number;      // Unix timestamp when query was sent
   responseReceivedAt?: number;  // Unix timestamp when response was received
-  
+
   [key: string]: any;
 }