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* feat(watchsync): add plugin-backed providers * fix(watchsync): address plugin review findings * fix(watchsync): harden plugin provider failures * feat(watchsync): complete plugin provider contract * fix(watchsync): address provider review feedback * fix(watchsync): keep device state host-private * fix(watchsync): build reconciliation index concurrently * fix(watchsync): preserve empty device state updates * chore(deps): use released watch-sync SDK --------- Co-authored-by: Quick <31828688+Quick104@users.noreply.github.com>