Split device sync into per-domain slots with bounded, dirty-only publishes

One monolithic snapshot per device outgrew a vanilla relay's 64KB event
cap the moment real payment traffic arrived, and sync silently died.
Snapshots now fragment into per-domain replaceable events (core wallet,
ark, nwc — an extension claims a domain by naming it), published under a
new ':x:' d-tag marker that pre-split clients don't match, so they can
never mistake a fragment for a full snapshot. Only domains whose content
changed republish, a refused publish retries on the next save instead of
being marked done, and readers apply full-snapshot semantics only to
core-carrying events. The ark projection also caps its history: spent
stubs at 200, done actions at 50 — the event size is bounded for life,
no special relay rules required.

Co-Authored-By: Claude Fable 5 <[email protected]>

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