fix(agent): raise tool rounds and ease calendar creates

Local models were burning the 8-round budget on simple event adds.
Raise the limit, resolve calendars by name/default, and inject the
household clock so relative dates work.

src/modules/agent/server/run.ts

@@ -1,13 +1,13 @@
 import { createLlmClient, type ChatMessage, type LlmClient } from "@/lib/llm";
 import { buildVisionContentParts, textFromMessageContent } from "@/lib/llm/content";
-import { AGENT_SYSTEM_PROMPT, AGENT_TOOLS } from "../tools";
+import { AGENT_SYSTEM_PROMPT, AGENT_TOOLS, appendAgentRuntimeContext } from "../tools";
 import type { ClientChatMessage } from "../messages";
 import { describeToolActivity } from "../tool-labels";
 import { createApiToolExecutor, type ToolExecutor } from "../tool-executor";
 import { resolveAssistantImageDataUrls } from "./resolve-images";
 import { thinkingLabel, type AgentProgressEvent } from "./progress";
 
-const MAX_TOOL_ROUNDS = 8;
+const MAX_TOOL_ROUNDS = 24;
 
 export type AgentToolCallSummary = {
   name: string;
@@ -53,7 +53,7 @@ export async function runAgentChat(options: {
   const llm = options.llm ?? createLlmClient({ model: options.model });
   const executeTool = options.executeTool ?? createApiToolExecutor(options.request);
   const onProgress = options.onProgress;
-  const systemPrompt = options.systemPrompt ?? AGENT_SYSTEM_PROMPT;
+  const systemPrompt = appendAgentRuntimeContext(options.systemPrompt ?? AGENT_SYSTEM_PROMPT);
 
   const userMessages = await Promise.all(
     options.messages.map((message) => toLlmUserMessage(message)),