When Alice syncs state with a Trusted peer Bob, she now learns about
Bob's other Trusted peers and auto-adds them as Observers on her side
— so Carol's fips_npub is known locally and subsequent federation
traffic to Carol can route directly over FIPS without a separate
invite round-trip.
- NodeStateSnapshot gains a `federated_peers: Vec<FederationPeerHint>`
field (serde default for backward compat with v1.4 snapshots).
- FederationPeerHint is a minimal projection: did, pubkey, onion,
name, fips_npub — excludes per-receiver fields (trust_level,
added_at, last_seen, last_state).
- build_local_state takes the local federation list and includes only
Trusted peers. Observer/Untrusted peers are NOT re-exported — a
node shouldn't launder other people's federation through its own
authority.
- sync_with_peer merges the received hints via merge_transitive_peers
when the source is Trusted: existing entries get fips_npub
refreshed if missing; unknown DIDs are added at Observer trust
(never auto-promoted to Trusted).
- Bounded to 1 hop: merged Observer entries do NOT get re-exported in
the local node's own snapshots. So Bob → Alice learns Carol, but
Alice's snapshots to Dave do not include Carol.
- Tests: round-trip + filter-non-trusted-from-snapshot coverage.
- Storage + delta test fixtures updated for the new field.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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