The indexer fan-out already used lists.dmInbox (strict), but the
LocalCache fast-path in DmInboxRelayResolver.resolve() — and the
no-resolver fallback in DesktopIAccount — went through the lenient
User.dmInboxRelays(), which falls back to NIP-65 read relays (kind:10002)
when the recipient has no kind:10050.
Because that fast-path returns first and short-circuits the strict
indexer lookup, a recipient with NIP-65 read relays but no published
DM-inbox would get gift wraps published to relays they never designated
for DMs — re-introducing the metadata leak (recipient pubkey + send
timing) the P0 fix was meant to close. LocalCache commonly holds
kind:10002 but not kind:10050, so this path fired often.
Switch both LocalCache lookups to dmInboxRelaysStrict().
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>