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

Start by tracing the /resume and /session commands and the copilot --resume CLI entry point, then inspect how sessions record or match their working directory. Done means the default lists only sessions for the current directory or repo, while an explicit all-sessions option preserves the broader view across all three entry points.