Add ToolRenderResult interface for custom tool rendering

- Changed ToolRenderer return type from TemplateResult to ToolRenderResult
- ToolRenderResult = { content: TemplateResult, isCustom: boolean }
- isCustom: true = no card wrapper, false = wrap in card
- Updated all existing tool renderers to return new format
- Updated Messages.ts to handle custom rendering

This enables tools to render without default card chrome when needed.

packages/web-ui/src/agent/transports/AppTransport.ts

@@ -1,12 +1,12 @@
 import type {
 	AgentContext,
+	AgentLoopConfig,
 	Api,
 	AssistantMessage,
 	AssistantMessageEvent,
 	Context,
 	Message,
 	Model,
-	PromptConfig,
 	SimpleStreamOptions,
 	ToolCall,
 	UserMessage,
@@ -348,9 +348,10 @@ export class AppTransport implements AgentTransport {
 			tools: cfg.tools,
 		};
 
-		const pc: PromptConfig = {
+		const pc: AgentLoopConfig = {
 			model: cfg.model,
 			reasoning: cfg.reasoning,
+			getQueuedMessages: cfg.getQueuedMessages,
 		};
 
 		// Yield events from the upstream agentLoop iterator

packages/web-ui/src/agent/transports/ProviderTransport.ts

@@ -1,4 +1,10 @@
-import { type AgentContext, agentLoop, type Message, type PromptConfig, type UserMessage } from "@mariozechner/pi-ai";
+import {
+	type AgentContext,
+	type AgentLoopConfig,
+	agentLoop,
+	type Message,
+	type UserMessage,
+} from "@mariozechner/pi-ai";
 import { getAppStorage } from "../../storage/app-storage.js";
 import type { AgentRunConfig, AgentTransport } from "./types.js";
 
@@ -34,10 +40,11 @@ export class ProviderTransport implements AgentTransport {
 			tools: cfg.tools,
 		};
 
-		const pc: PromptConfig = {
+		const pc: AgentLoopConfig = {
 			model,
 			reasoning: cfg.reasoning,
 			apiKey,
+			getQueuedMessages: cfg.getQueuedMessages,
 		};
 
 		// Yield events from agentLoop

packages/web-ui/src/agent/transports/types.ts

@@ -1,4 +1,4 @@
-import type { AgentEvent, AgentTool, Message, Model } from "@mariozechner/pi-ai";
+import type { AgentEvent, AgentTool, Message, Model, QueuedMessage } from "@mariozechner/pi-ai";
 
 // The minimal configuration needed to run a turn.
 export interface AgentRunConfig {
@@ -6,6 +6,7 @@ export interface AgentRunConfig {
 	tools: AgentTool<any>[];
 	model: Model<any>;
 	reasoning?: "low" | "medium" | "high";
+	getQueuedMessages?: <T>() => Promise<QueuedMessage<T>[]>;
 }
 
 // Events yielded by transports must match the @mariozechner/pi-ai prompt() events.