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/core/index.ts

@@ -14,16 +14,16 @@ export {
 export { type BashExecutorOptions, type BashResult, executeBash } from "./bash-executor.js";
 export type { CompactionResult } from "./compaction/index.js";
 export {
-	type CustomAgentTool,
+	type CustomTool,
+	type CustomToolAPI,
 	type CustomToolFactory,
 	type CustomToolsLoadResult,
+	type CustomToolUIContext,
 	discoverAndLoadCustomTools,
 	type ExecResult,
 	type LoadedCustomTool,
 	loadCustomTools,
 	type RenderResultOptions,
-	type ToolAPI,
-	type ToolUIContext,
 } from "./custom-tools/index.js";
 export {
 	type HookAPI,