chore: establish local platform baseline

internal/buildinfo/buildinfo.go

@@ -0,0 +1,17 @@
+package buildinfo
+
+var (
+	Version   = "dev"
+	Commit    = "unknown"
+	BuildTime = "unknown"
+)
+
+type Info struct {
+	Version   string `json:"version"`
+	Commit    string `json:"commit"`
+	BuildTime string `json:"build_time"`
+}
+
+func Current() Info {
+	return Info{Version: Version, Commit: Commit, BuildTime: BuildTime}
+}