sessions: 🐛 Let the root interrupt its own Orca lane

[yasyf]

Context: At 8:29 AM on October 6, 2026, the release-v3 drive root ran orca terminal send --terminal term_4137f7d4-… --text 'STOP THE ROLLBACK. …' --interrupt against its own incident lane, dispatch ctx_83a95c65e319 in Run run_7715a23a5657. The lane was mid-turn preparing a rollback the owner had just forbidden. orca_send_ends_session blocked the call with "interrupts or exits the agent in another terminal, which ends that session … leave interrupts and exits to the owner." Ordinary text would only have queued until the lane's turn ended. The owner asked for the hook to be fixed.

Summary: orca_send_ends_session now allows --interrupt when the send names one literal --terminal and the caller is the main session whose ORCA_TERMINAL_HANDLE coordinates the Run of that terminal's dispatch. The guard finds the dispatch with worker_of, the worker-list scan the settled-close lift uses, and checks the coordinator with coordinates(), the same check the 12.88.15 worker-stop lift relies on. Exit text such as exit, /quit, logout, or a control byte stays blocked for everyone with the original message. An interrupt from a lane terminal, an in-process subagent, another Run's coordinator, or a session with no readable worker stays blocked, as does a handle or text named at run time.

Motivation: An --interrupt stops the lane's current turn and delivers the text; it does not end the session. The root already owns the Run and may stop its lanes outright under cc-notes answer edfa70e. Making it wait for the owner to interrupt a lane is a round trip with no safety gained, and here it let a forbidden rollback keep running.

Details: interrupts_own_lane reuses lone_target and spelled from the worker-stop lift; own_lane sits beside own_dispatch in _sessions.py. orca_send_verdict now takes the scan and event so it can probe. The blocked-interrupt message keeps the original first sentence and names the allowed route. inline_worker gained a run parameter for the other-Run test. The inline tests pin the 8:29 AM command verbatim, a send piped to tail followed by a cci post, as an Allow for the coordinating root, plus Blocks for no coordinator handle, a lane terminal, a subagent, another Run, no worker row, --text exit --interrupt, /quit, a "$T" handle, and "$MSG" text.