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Introduces autosave_id as a third, unversioned layer above draft/head,
with lock_for_editing!, autosave!, and save_draft! as the new entry
points. Also fixes a real bug in wipe_draft!: its "no draft" branch
unconditionally released the lock, which was safe when "no draft" only
ever meant "nothing is happening" — no longer true now that a lock can
exist with only an autosave beneath it. lock_for_editing! deliberately
does not call wipe_draft! at all, for the same reason: an intruder
calling it while a lock was genuinely held would otherwise silently
steal it via wipe_draft!'s own unlock side effect, caught by the new
two-user lock test.
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