[FEATURE] Interactive session deletion in the `--resume` picker (like Ctrl+X in `claude agents`)

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Summary

The claude --resume picker has no way to delete a session. You can preview (Space), rename (Ctrl+R), filter by project/branch/worktree, and search — but old or forked sessions can only be removed by manually deleting .jsonl files from ~/.claude/projects/<project>/. The claude agents view already supports interactive removal via Ctrl+X; the resume picker should offer the same.

Motivation

• Forked sessions and dead-end resumes accumulate quickly and clutter the picker, making it hard to find the session you actually want.
• The only current way to clean them up is to leave the picker, locate the right .jsonl on disk, and rm it by hand — error-prone and easy to delete the wrong one.
• claude agents already establishes the pattern (Ctrl+X to remove), so there's a consistent, discoverable UX to mirror.

Proposed Solution

In the claude --resume picker:

1. Add a Ctrl+X binding to delete the highlighted session, matching claude agents.
2. Use the same confirm-by-repeat behavior as claude agents: the first Ctrl+X prompts "press Ctrl+X again to confirm," and a second Ctrl+X deletes. No separate confirmation dialog — behavior should be identical to claude agents.
3. Refuse or warn when the target is a live/background session (e.g. a running background agent) — stop it first rather than deleting the file out from under it.
4. Reflect the deletion in the list immediately and add the key to the picker footer (alongside Ctrl+R to rename, etc.).

Alternative Solutions

There is no in-picker option today. The only current ways to delete a session:

1. Delete the transcript file manually. Each session/fork is one .jsonl under ~/.claude/projects/<project>/. Removing it drops it from the picker (permanent, no undo):

``bash
rm ~/.claude/projects/<project>/<session-id>.jsonl
``

1. Stop live/background sessions first. If the session is still running as a background agent, deleting the file out from under it is unsafe — stop it in claude agents (Ctrl+X) first, then delete the .jsonl.

Both are manual, out-of-band, and easy to get wrong (deleting the wrong file, or a still-live session) — which is exactly why an in-picker delete is wanted.

Priority

Medium - Would be very helpful

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

Environment

• Claude Code version: 2.1.198
• Platform: Linux (CLI / console)

Related

• #79122
• #79435