Delete ONE of the caller's own runs, and revoke any public share of it.

Owner-only, same session-wins-else-X-Vega-Key-else-pair resolution as the poll/export/share routes; the shared guest key with no session is refused (guest A must not delete guest B's run). A run you don't own answers the SAME 404 "Backtest not found" as a run that never existed, and a second delete is that same plain 404 — never a 500.

The share is revoked FIRST and in the same request (reusing db.revoke_shares_for_run, the helper behind DELETE /v1/backtests/{id}/share): a public link that outlived its run would 404 for the reader while still looking like a live link to whoever holds it. Returns {"deleted": run_id, "share_revoked": bool}.

A DEPLOYED bot is unaffected — a grade attached to a deployment lives in deployment.backtest_result, its own copy, so deleting the run never blanks a bot's report card. No confirm flag: a run is a receipt of a computation, not money history, and the member can always run it again.