Rework custom tools API with CustomToolContext

- CustomAgentTool renamed to CustomTool
- ToolAPI renamed to CustomToolAPI
- ToolContext renamed to CustomToolContext
- ToolSessionEvent renamed to CustomToolSessionEvent
- Added CustomToolContext parameter to execute() and onSession()
- CustomToolFactory now returns CustomTool<any, any> for type compatibility
- dispose() replaced with onSession({ reason: 'shutdown' })
- Added wrapCustomTool() to convert CustomTool to AgentTool
- Session exposes setToolUIContext() instead of leaking internals
- Fix ToolExecutionComponent to sync with toolOutputExpanded state
- Update all custom tool examples for new API

packages/coding-agent/src/modes/interactive/components/tool-execution.ts

@@ -11,7 +11,7 @@ import {
 	type TUI,
 } from "@mariozechner/pi-tui";
 import stripAnsi from "strip-ansi";
-import type { CustomAgentTool } from "../../../core/custom-tools/types.js";
+import type { CustomTool } from "../../../core/custom-tools/types.js";
 import { DEFAULT_MAX_BYTES, DEFAULT_MAX_LINES, formatSize } from "../../../core/tools/truncate.js";
 import { getLanguageFromPath, highlightCode, theme } from "../theme/theme.js";
 import { renderDiff } from "./diff.js";
@@ -55,7 +55,7 @@ export class ToolExecutionComponent extends Container {
 	private expanded = false;
 	private showImages: boolean;
 	private isPartial = true;
-	private customTool?: CustomAgentTool;
+	private customTool?: CustomTool;
 	private ui: TUI;
 	private result?: {
 		content: Array<{ type: string; text?: string; data?: string; mimeType?: string }>;
@@ -67,7 +67,7 @@ export class ToolExecutionComponent extends Container {
 		toolName: string,
 		args: any,
 		options: ToolExecutionOptions = {},
-		customTool: CustomAgentTool | undefined,
+		customTool: CustomTool | undefined,
 		ui: TUI,
 	) {
 		super();