fix(save): extend the killed-buffer guard to the text-field savers

The atomic savers got this guard last commit, and the free-text savers share the same async exposure. pearl--save-field-push advances the provenance hash and runs the :after-push thunk through the marker after the push returns, and the description saver's outcome callback resyncs the Org hash the same way -- both signal if the buffer was killed in between. Both now check pearl--marker-live-p and skip the buffer touch while still reporting the remote outcome. I moved pearl--marker-live-p above the first caller so it's defined before all three use sites (no forward reference).

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