`/resume` cannot surface sessions launched from a bare+worktrees root

Summary

When claude is launched from the root of a "bare + sibling worktrees" git layout — where the launch dir contains .bare/ and a .git file (gitdir: ./.bare) but is itself not a registered worktree — session JSONLs are written correctly, but /resume cannot list them under any scope toggle except Ctrl+A (all projects).

Repro

Layout:

myrepo/               # launch dir: contains `.git` file pointing at .bare/, NOT a registered worktree
├── .bare/            # the gitdir (bare repo)
├── main/             # registered worktree (branch: main)
└── docs/             # registered worktree

git worktree list from the root:

/path/to/myrepo/.bare  (bare)
/path/to/myrepo/main   abc1234 [main]

git rev-parse --show-toplevel from the root: fatal: this operation must be run in a work tree.

1. cd myrepo && claude → runs fine; jsonls written to ~/.claude/projects/-path-to-myrepo/ with cwd: /path/to/myrepo and gitBranch: main.
2. Accumulate N sessions this way.
3. /resume from the same dir → empty list. Header shows scope .bare · myrepo.
4. Ctrl+B (current branch): still empty — filter is branch .bare, but stored sessions have gitBranch: main.
5. Ctrl+W (all worktrees): shows only sessions stored under registered worktrees (main/, docs/) — never the sessions at the root project dir, because git worktree list has no entry for the root.
6. Ctrl+A (all projects): finally shows them, mixed in with every other project globally.

Expected

Either:

• Default scope should include the launch dir's own project dir under ~/.claude/projects/…, even when the launch dir isn't a registered worktree, or
• A settings key (e.g. resume.defaultScope: "project" | "worktrees" | "all") to pin the default.

Actual

Sessions are reachable only via Ctrl+A (noisy) or claude -c / --resume <id> (bypass the picker). From the user's POV: "my history disappeared" when launching from the root.

Workarounds tried

• Ctrl+W — only walks git worktree list, root isn't listed, so misses the sessions.
• Moving jsonls into a sibling worktree's project dir — works until next new session is written.
• Registering the root as a worktree (git worktree add --force . <branch>) — changes repo layout and pollutes the root dir.

Environment

• Claude Code 2.1.117
• macOS 26.4 (arm64)
• git worktree layout: bare at ./.bare, siblings for each branch