Cron jobs are scheduled work bound to the source profile and its origin
channel. A clone that inherited cron/jobs.json fired every job twice: two
gateways with identical job ids running the same weekly jobs in parallel
(double spend, duplicate deliveries) until one gateway died.
Root cause: `cron` was not in _CLONE_ALL_HISTORY_EXCLUDE_ROOT, so the
copytree in _clone_all_into carried jobs.json along. Add it to the
per-profile history exclude set (applies to any source, CLI, dashboard
and TUI/desktop RPC all funnel through create_profile), recreate the
_PROFILE_DIRS skeleton after the copy so the clone still has an empty
cron/ (and sessions/), and say so in the CLI summary line and docs.
--clone (config-only) never copied cron; export/backup keep cron as
before (an archive is a portable snapshot, not a second live profile).
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