Feature request:  /resume  and  /session  should support filtering by current working directory

Describe the feature or problem you'd like to solve

Currently,  /resume  and  /session  list ALL sessions across every project/directory I've ever worked in, with no way to scope the list to the current repo/cwd. This makes it hard to find the right session to resume when I have many sessions across different projects.

Proposed solution

Requested behavior:

• By default,  /resume  and  /session  should show only sessions started in (or associated with) the current working directory / repo.
• Provide a flag or toggle (e.g.  /resume --all ) to view sessions from all directories when needed.
• Same behavior for  copilot --resume  from the CLI flag.

This would make session resumption much faster and less error-prone for users who work across multiple repositories.

Example prompts or workflows

No response

Additional context

No response

/resume と /session コマンド、および CLI エントリポイント copilot --resume の追跡から始め、次にセッションが作業ディレクトリをどのように記録または照合しているかを調べます。デフォルトの一覧に現在のディレクトリまたはリポジトリのセッションだけが表示され、明示的な all-sessions オプションによって3つすべてのエントリポイントでより広い範囲の表示が維持されれば完了です。