fix: resolve parameterized $compareTo types and fix array count type

- VisitNameAndData: return any instead of named struct when mergeCompareTo
  resolves $compareTo, fixing field type mismatches for switch/container types
- ContainerCompareTo: traverse anon/bitfield fields for compareTo resolution,
  fixes entityMetadata 'field not found' errors
- Array.Count: change from string to any to handle numeric count values
- ArrayEncoder: fix nil check to correctly write length prefix for arrays
- ArrayDecoder: use fmt.Sprint for safe Count conversion

mc/proto_generated/v1_21_8/proto.go

@@ -1,6 +1,6 @@
 // Code generated by strom. DO NOT EDIT.
 // source: minecraft-data/pc/1.21.8/protocol.json (sha256:930fbb4c69fd2ecadddcee3c38d3f02908adc23b54b707cb21112e7ab1e9dba1)
-// version: (devel) (go1.26.2)
+// version: v0.6.6-0.20260805154326-fa70ea36c6f5+dirty (go1.26.2)
 package v1_21_8
 
 import (
@@ -20500,7 +20500,7 @@ func (ret *PlayToClientPacketTrackedWaypoint) Decode(r io.ReadSeeker) (err error
 	if err != nil {
 		return
 	}
-	switch ret.Waypoint.Type {
+	switch ret.Waypoint.Anon {
 	case "azimuth":
 		var PlayToClientPacketTrackedWaypointWaypointDataAzimuthTmp float32
 		err = binary.Read(r, binary.BigEndian, &PlayToClientPacketTrackedWaypointWaypointDataAzimuthTmp)
@@ -20607,7 +20607,7 @@ func (ret *PlayToClientPacketTrackedWaypoint) Encode(w io.Writer) (err error) {
 	if err != nil {
 		return
 	}
-	switch ret.Waypoint.Type {
+	switch ret.Waypoint.Anon {
 	case "azimuth":
 		PlayToClientPacketTrackedWaypointWaypointData, ok := ret.Waypoint.Data.(float32)
 		if !ok {