Wires the receive side of Layer 1 vouch distribution:
- profile::scan_vouch_grants_for_all_personas reads the VouchGrantBatch
from an incoming profile post, trial-decrypts each wrapper against
every persona's X25519 private scalar, and inserts successful unlocks
into vouch_keys_received. Idempotent via the bio_scan_cache.
- apply_profile_post_if_applicable now calls the scan before the
timestamp-based last-writer-wins short-circuit on display_name/bio.
A profile post that arrives "older" than what we've stored can still
carry vouch grants we haven't seen — bio_epoch is the actual
freshness signal for the wrapper batch.
- Follow-gated per the spec: skipped if the bio author isn't in
follows. Self-authored posts skipped (we already have our own V_me).
- storage::is_follow helper added (cheap COUNT membership check).
Two new integration tests cover the wire:
- vouch_grant_end_to_end_via_bio_post: Bob's signed profile post
carries a real wrapper for Alice + 7 dummies; Alice's keyring picks
up V_bob and the scan cache records the hit.
- vouch_grant_skipped_for_non_followed_author: same post, but Alice
doesn't follow Bob → no scan, no keyring entry.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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