Let a thread drop its worktree without a pull request

[scriptease]

What happened

Some workflows can't use a pull request (Gerrit, cherry-picking into another branch, local-only experiments). Once the work has landed elsewhere, the thread's worktree has no clean exit:

• Deleting the worktree is only offered when deleting the whole thread.
• "Delete settled worktrees" (storage cleanup) only removes it after settlement.
• Asking the agent to git worktree remove it works only until the next message: the next turn recreates the worktree from the thread's branch.

Observed: the agent removed ~/.t3/worktrees/<project>/<branch> at 04:49:43, the next user message started a turn at 04:50:29, and by 04:50:42 the worktree was back as a fresh checkout (without node_modules).

Diagnosis

apps/server/src/orchestration-v2/ProviderTurnStartService.ts (turn start) recreates any missing managed worktree from projection.thread.worktreePath / branch and logs "provider turn start recreating missing worktree". That's correct after storage cleanup or a rollback. But T3 has no way to learn that a removal was intentional, because the thread still holds worktreePath / branch.

Proposal

A "Remove worktree" thread action, available in the sidebar/thread menu, the command palette, mobile, and the MCP t3_thread_organize tool so the agent can run it when asked:

• refuse, or ask for confirmation, when the worktree has uncommitted changes or unpushed commits
• stop the session, run git worktree remove, and keep the branch
• clear the thread's worktreePath (the thread falls back to the project root) and record the detachment, so turn start doesn't recreate the worktree
• leave the thread settleable

Reverse state: "Recreate worktree" from the kept branch, which is what turn start already does today.

Steps to reproduce

1. Run a thread in a managed worktree and finish the work without a PR.
2. Ask the agent to remove the worktree, or run git worktree remove yourself.
3. Send any follow-up message. The worktree is recreated.

Version

upstream main 8a9d0e0dd (2026-10-21)

Related: #17813, #21372

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