feat(saved): add pearl-delete-saved-query and a sentinel cancel for run

`pearl-saved-queries' was write-only from a user's perspective. Save was bound to the builder, run was bound to a key, but removing a stale entry meant `M-x customize-variable RET pearl-saved-queries RET` and a manual delete from the Customize buffer. `pearl-delete-saved-query` under `C-; L k q` (and `q` in the transient's Delete group) closes that gap: completes over the saved query names with `[ None. ]` at the top as a cancel, confirms, removes the entry, and persists via `customize-save-variable`. Linear is untouched. Saved queries are local. Pushing them up to Linear as custom views is a separate spec.

While in the same path, `pearl-run-saved-query` got the same sentinel cancel. Both prompts use the keep-order completion table so `[ None. ]` stays at the top regardless of the user's completion sorter. Both error cleanly when `pearl-saved-queries` is empty rather than offering an empty picker. Six tests cover the new command (delete-on-yes, no-at-confirm, sentinel-cancels, unknown-name-errors, empty-list-errors) plus run's sentinel cancel.

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