chore: commit pending changes from session

- Add permission rules to .claude/settings.json
- Document empty merge and direct-to-master problems in problems.md
- Fix agent stream URL to use vite proxy instead of hardcoded host
- Add /agents proxy config to vite.config.ts

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/api/agents.ts

@@ -128,8 +128,7 @@ export function subscribeAgentStream(
 	onEvent: (event: AgentEvent) => void,
 	onError?: (error: Event) => void,
 ): () => void {
-	const host = import.meta.env.DEV ? "http://127.0.0.1:3001" : "";
-	const url = `${host}/agents/${encodeURIComponent(storyId)}/${encodeURIComponent(agentName)}/stream`;
+	const url = `/agents/${encodeURIComponent(storyId)}/${encodeURIComponent(agentName)}/stream`;
 
 	const eventSource = new EventSource(url);