RouteDef gains Public field (bool) for edge routing. ServiceDef gains
Tier field. Node validation relaxed: defaults to tier=worker when both
node and tier are empty (v2 compatibility).
ToProto/FromProto updated to round-trip all new fields. Without this,
public=true in TOML was silently dropped and edge routing never triggered.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Kyle Isom
22a836812f