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/index.ts

@@ -35,15 +35,16 @@ export {
 // Custom tools
 export type {
 	AgentToolUpdateCallback,
-	CustomAgentTool,
+	CustomTool,
+	CustomToolAPI,
+	CustomToolContext,
 	CustomToolFactory,
+	CustomToolSessionEvent,
 	CustomToolsLoadResult,
+	CustomToolUIContext,
 	ExecResult,
 	LoadedCustomTool,
 	RenderResultOptions,
-	SessionEvent as ToolSessionEvent,
-	ToolAPI,
-	ToolUIContext,
 } from "./core/custom-tools/index.js";
 export { discoverAndLoadCustomTools, loadCustomTools } from "./core/custom-tools/index.js";
 export type * from "./core/hooks/index.js";