Code Farm: per-plot auto-replant pause and crop-lock check; community sync and node work

Continuous Delivery could never be turned off once a crop was planted. Add a
one-shot per-plot "stop after harvest" flag (POST /game/plot/stop, Devii tool
game_plot_stop, game_plots.stop_after_harvest), cleared by the next plant,
autoreplant claim or Refactor. Autoreplant now also respects crop locks through
the shared _crop_lock predicate. Plan and measurements in happyplanting.md.

Also includes the pending community sync, node network and related work in the
tree; the full suite passed (4999) with all of it.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

nodes/client/protocol.go

@@ -37,6 +37,12 @@ const (
 	MaxDonorMBPerDay      = 20 * 1024
 	StableSessionSeconds  = 30
 	FastRetryMillis       = 1500
+
+	SuspendedReason         = "suspended"
+	SuspendedMinSeconds     = 60
+	SuspendedMaxSeconds     = 24 * 60 * 60
+	SuspendedDefaultSeconds = 300
+	SuspendedJitterSeconds  = 30
 )
 
 const (
@@ -48,6 +54,7 @@ const (
 	RefuseBandwidth   = "bandwidth_exhausted"
 	RefuseConcurrency = "concurrency_exceeded"
 	RefuseHours       = "outside_hours"
+	RefuseBattery     = "on_battery"
 	RefuseTimeout     = "timeout"
 	RefuseBadURL      = "bad_url"
 	FailFetch         = "fetch_failed"
@@ -71,7 +78,6 @@ const (
 
 var FatalReasons = map[string]bool{
 	"revoked":          true,
-	"suspended":        true,
 	"kill_switch":      true,
 	"no_consent":       true,
 	"no_account":       true,
@@ -117,6 +123,7 @@ type ServerSettings struct {
 	ActiveFrom     string `json:"active_from"`
 	ActiveTo       string `json:"active_to"`
 	Timezone       string `json:"timezone"`
+	PauseOnBattery bool   `json:"pause_on_battery"`
 }
 
 type Frame struct {
@@ -131,6 +138,8 @@ type Frame struct {
 	Port         int             `json:"port"`
 	B64          string          `json:"b64"`
 	Reason       string          `json:"reason"`
+	Until        string          `json:"until"`
+	DeviceLabel  string          `json:"device_label"`
 	DeviceUID    string          `json:"device_uid"`
 	Limits       *ServerLimits   `json:"limits"`
 	Destinations []Destination   `json:"destinations"`