projection: begin the exact-path public epoch

The public tree and its history contain only the listed paths. Earlier projection history remains preserved internally.

Source-Sha: 913fde029b935671833254797f0f20f1eb9fabba

Policy-Sha: 913fde029b935671833254797f0f20f1eb9fabba

Tree-Digest: 180ae530c1058a2a5c89837bdce2d323ae83e669e38590ca72e75b8d92b7262f

server/internal/utils/version.go

@@ -0,0 +1,69 @@
+package utils
+
+import (
+	"strconv"
+	"strings"
+)
+
+// CompareVersions compares two semantic version strings
+// Returns:
+//   -1 if version1 < version2
+//    0 if version1 == version2
+//    1 if version1 > version2
+func CompareVersions(version1, version2 string) int {
+	// Parse version strings (format "0.1.4" or "0.2.3.10" — any octet count)
+	v1Parts := parseVersion(version1)
+	v2Parts := parseVersion(version2)
+
+	maxLen := len(v1Parts)
+	if len(v2Parts) > maxLen {
+		maxLen = len(v2Parts)
+	}
+
+	// Compare octet by octet; missing trailing octets count as 0
+	for i := 0; i < maxLen; i++ {
+		v1 := 0
+		v2 := 0
+		if i < len(v1Parts) {
+			v1 = v1Parts[i]
+		}
+		if i < len(v2Parts) {
+			v2 = v2Parts[i]
+		}
+		if v1 < v2 {
+			return -1
+		}
+		if v1 > v2 {
+			return 1
+		}
+	}
+
+	return 0
+}
+
+// IsNewerVersion returns true if version1 is newer than version2
+func IsNewerVersion(version1, version2 string) bool {
+	return CompareVersions(version1, version2) == 1
+}
+
+// IsNewerOrEqualVersion returns true if version1 is newer than or equal to version2
+func IsNewerOrEqualVersion(version1, version2 string) bool {
+	cmp := CompareVersions(version1, version2)
+	return cmp == 1 || cmp == 0
+}
+
+// parseVersion parses a version string like "0.1.4" or "0.2.3.10" into its
+// octets, e.g. [0, 2, 3, 10]. Unparsable octets default to 0.
+func parseVersion(version string) []int {
+	cleanVersion := strings.TrimPrefix(version, "v")
+	parts := strings.Split(cleanVersion, ".")
+
+	result := make([]int, len(parts))
+	for i, p := range parts {
+		if num, err := strconv.Atoi(p); err == nil {
+			result[i] = num
+		}
+	}
+
+	return result
+}