Feature request: session naming and renaming

[zinknovo]

Feature request: session naming and renaming

--list-sessions/--delete-session/-r exist, but missing:

• --name at launch
• /rename in-session (related: closed PR Add /rename slash command #14616)
• Auto-summary for session list display
• Cross-project listing
• Resume by fuzzy name match

Reference implementation: https://gist.github.com/zinknovo/5fbd2eddcbf7bc5dd89c0dee59b05eb7

Happy to contribute a TypeScript PR.

[jk-kashe]

See #22924