pushAllClients() already has every client profile from its own
listClients() call, but looped through pushClient(key) -> getClient(key)
-> listClients() again for each one - N clients meant N+1 full
order-history recomputations instead of one. pushClient now accepts an
optional already-known profile so the bulk path skips the redundant
lookup; single-key callers (scheduleServerPush's debounce) are
unaffected.
compareClientSources() had the same shape of duplicate work: it called
buildClients()/serverListClients() directly and then again inside
mergeClientSources(). mergeClientSources() now accepts already-computed
local/server arrays instead of always recomputing both.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
