feat: Add FrequencyTrie model fingerprints for EGOTHOR v4 analyzer identity

The fingerprint covers trie metadata and the compiled node graph, exposes
a lowercase hex representation plus defensive raw bytes, and is stable
across equivalent trie builds and persistence round-trips.

.project

@@ -2,22 +2,21 @@
 <projectDescription>
 	<name>Radixor</name>
 	<comment></comment>
-	<projects>
-	</projects>
-	<buildSpec>
-		<buildCommand>
-			<name>org.eclipse.jdt.core.javabuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-		<buildCommand>
-			<name>org.eclipse.buildship.core.gradleprojectbuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-	</buildSpec>
+	<projects/>
 	<natures>
 		<nature>org.eclipse.jdt.core.javanature</nature>
 		<nature>org.eclipse.buildship.core.gradleprojectnature</nature>
 	</natures>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments/>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.buildship.core.gradleprojectbuilder</name>
+			<arguments/>
+		</buildCommand>
+	</buildSpec>
+	<linkedResources/>
+	<filteredResources/>
 </projectDescription>