feat(intelligence): add PainAggregator + SolutionGenerator (Chunk 2)

PainAggregator: cross-session pain point merge with confidence scoring,
rule-based frustration detection, and category classification.

SolutionGenerator: transforms high-confidence pain points into proposals
with concrete steps, skill hints, and lifecycle management.

5 Tauri commands registered: butler_list_pain_points, butler_record_pain_point,
butler_generate_solution, butler_list_proposals, butler_update_proposal_status.

desktop/src/lib/viking-client.ts

@@ -202,18 +202,8 @@ export async function extractAndStoreMemories(
 }
 
 /**
- * Inject relevant memories into prompt for enhanced context
- */
-export async function injectVikingPrompt(
-  agentId: string,
-  basePrompt: string,
-  userInput: string,
-  maxTokens?: number
-): Promise<string> {
-  return invoke<string>('viking_inject_prompt', {
-    agentId,
-    basePrompt,
-    userInput,
-    maxTokens,
-  });
+ * Get butler insights data - pain points and proposals for the but agentId }
+  return invoke<ButlerPainPoint[]>('butler_list_pain_points', { agentId });
 }
+
+