Tracks HMAC-failure count separately from consecutive_failures (network
errors). Auth failures and network failures have different resolution
paths; mixing them would let a single successful retry after a network
blip mask real secret desync.
Part of backlog #19 — outbox auth-failure recovery.
Note: drizzle-kit generated the 0003 SQL with an unexpected CREATE TABLE
for peer_approval_requests because the 0002 migration was authored
manually without a corresponding 0002_snapshot.json (see 14041e9). The
generated SQL has been trimmed to the single intended ALTER TABLE. The
regenerated 0003_snapshot.json correctly reflects the full current
schema, so future migrations will diff cleanly.
Adds `auto_accept_peering` integer column (default 1/true) to the
`instance_settings` singleton table, controlling whether this instance
auto-accepts incoming peering requests. Includes generated migration
`0001_clear_earthquake.sql` applied automatically on server boot.
Jannis Braun