feat(coding-agent): enabled importing foreign sessions from claude and codex

- Implemented session stores and metadata converters to import Claude and Codex sessions into OMP.
- Added `--from-claude` and `--from-codex` CLI flags and `/resume` command arguments for foreign session resolution.
- Updated session selector components and controllers to support listing and picking external agent sessions.
- Added comprehensive unit tests and documentation covering foreign session import functionality.

packages/coding-agent/src/modes/interactive-mode.ts

@@ -103,6 +103,7 @@ import {
 	SHUTDOWN_CONSOLIDATE_BUDGET_MS,
 } from "../session/agent-session";
 import type { CompactMode } from "../session/compact-modes";
+import type { ForeignSessionSource } from "../session/foreign-session-store";
 import { HistoryStorage } from "../session/history-storage";
 import type { SessionContext } from "../session/session-context";
 import { getRecentSessions } from "../session/session-listing";
@@ -4685,8 +4686,8 @@ export class InteractiveMode implements InteractiveModeContext {
 		this.#selectorController.showTreeSelector();
 	}
 
-	showSessionSelector(): void {
-		this.#selectorController.showSessionSelector();
+	showSessionSelector(source?: ForeignSessionSource): void {
+		void this.#selectorController.showSessionSelector(source);
 	}
 
 	async handleResumeSession(sessionPath: string): Promise<void> {