Add Fleet Torrent erasure extension with shard DHT and gossip.

Content-addressed shard DHT on seeder agents with subnet_primary_seeder election, cross-subnet fleet_torrent_gossip, BGP swarm magnets, C2 torrent manifest, and k-of-n peer fetch with C2 fallback.

server/internal/ai/oath_recorder.go

@@ -0,0 +1,21 @@
+package ai
+
+// Oath action types and outcomes — mirrored in db/oath_ledger.go for SQLite rows.
+const (
+	OathSpreadTierEscalation = "spread_tier_escalation"
+	OathGraft                = "graft"
+	OathForkMerge            = "fork_merge"
+	OathStrainCardPlay       = "strain_card_play"
+	OathCourtL4Decision      = "court_l4_decision"
+	OathSpreadAttempt        = "spread_attempt"
+	OathStrainHospice        = "strain_hospice"
+
+	OathOutcomeSuccess = "success"
+	OathOutcomeFail    = "fail"
+	OathOutcomePending = "pending"
+)
+
+// OathRecorder persists immutable operator / AI council accountability rows.
+type OathRecorder interface {
+	Record(actor, actionType, agentID, strain, outcome string, whySource, payload interface{}) error
+}