feat: add final result rendering with status badges and artifacts

- FinalResult component showing SubagentResult summary and artifacts
- Status badges: Success (green), Partial (amber), Failed (red)
- Quality and source badges (Verified/Inferred, Tool Output/Web/etc)
- Artifact list with file icons
- Integrated into chat page after stream completes

Closes #10

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

src/routes/chat/+page.svelte

@@ -1,9 +1,11 @@
 <script lang="ts">
 	import type { ChatMessage } from '$lib/types';
+	import type { SubagentResult } from '$lib/proto/llm_multiverse/v1/common_pb';
 	import MessageList from '$lib/components/MessageList.svelte';
 	import MessageInput from '$lib/components/MessageInput.svelte';
 	import OrchestrationProgress from '$lib/components/OrchestrationProgress.svelte';
 	import ThinkingSection from '$lib/components/ThinkingSection.svelte';
+	import FinalResult from '$lib/components/FinalResult.svelte';
 	import { processRequest, OrchestratorError } from '$lib/services/orchestrator';
 	import { OrchestrationState } from '$lib/proto/llm_multiverse/v1/orchestrator_pb';
 
@@ -13,11 +15,13 @@
 	let sessionId = $state(crypto.randomUUID());
 	let orchestrationState: OrchestrationState = $state(OrchestrationState.UNSPECIFIED);
 	let intermediateResult: string = $state('');
+	let finalResult: SubagentResult | null = $state(null);
 
 	async function handleSend(content: string) {
 		error = null;
 		orchestrationState = OrchestrationState.UNSPECIFIED;
 		intermediateResult = '';
+		finalResult = null;
 
 		const userMessage: ChatMessage = {
 			id: crypto.randomUUID(),
@@ -43,6 +47,9 @@
 				if (response.intermediateResult) {
 					intermediateResult = response.intermediateResult;
 				}
+				if (response.finalResult) {
+					finalResult = response.finalResult;
+				}
 				const idx = messages.length - 1;
 				messages[idx] = {
 					...messages[idx],
@@ -91,6 +98,10 @@
 		</div>
 	{/if}
 
+	{#if finalResult && !isStreaming}
+		<FinalResult result={finalResult} />
+	{/if}
+
 	{#if error}
 		<div class="mx-4 mb-2 rounded-lg bg-red-50 px-4 py-2 text-sm text-red-600">
 			{error}