feat(pi-natives): added unified picker coordination for file search operations

- Added `wait_for_picker_scan()` function to search_db module with cancellation token support for polling picker scan completion.
- Integrated picker-based file search into glob matching logic with `collect_files_from_picker()` helper to reuse shared SearchDb picker results.
- Refactored fff and grep modules to use centralized `wait_for_picker_scan()` wrapper instead of direct FilePicker calls, improving cancellation handling.
- Propagated SearchDb instance through agent session initialization and input controller to enable unified file picker coordination across search operations.

packages/coding-agent/src/task/executor.ts

@@ -5,6 +5,7 @@
  */
 import path from "node:path";
 import type { AgentEvent, ThinkingLevel } from "@oh-my-pi/pi-agent-core";
+import type { SearchDb } from "@oh-my-pi/pi-natives";
 import { logger, untilAborted } from "@oh-my-pi/pi-utils";
 import type { TSchema } from "@sinclair/typebox";
 import Ajv, { type ValidateFunction } from "ajv";
@@ -147,6 +148,7 @@ export interface ExecutorOptions {
 	mcpManager?: MCPManager;
 	authStorage?: AuthStorage;
 	modelRegistry?: ModelRegistry;
+	searchDb?: SearchDb;
 	settings?: Settings;
 }
 
@@ -950,6 +952,7 @@ export async function runSubprocess(options: ExecutorOptions): Promise<SingleRes
 				cwd: worktree ?? cwd,
 				authStorage,
 				modelRegistry,
+				searchDb: options.searchDb,
 				settings: subagentSettings,
 				model,
 				thinkingLevel: effectiveThinkingLevel,
@@ -1042,6 +1045,7 @@ export async function runSubprocess(options: ExecutorOptions): Promise<SingleRes
 					},
 					{
 						getModel: () => session.model,
+						getSearchDb: () => session.searchDb,
 						isIdle: () => !session.isStreaming,
 						abort: () => session.abort(),
 						hasPendingMessages: () => session.queuedMessageCount > 0,