feat: add jqwik property-based coverage for trie and patch invariants

test: add property-based tests for FrequencyTrie determinism across repeated compilation
test: verify semantic alignment of get(), getAll(), and getEntries()
test: verify binary serialization and compressed persistence round-trip stability
test: verify builder reconstruction preserves observable trie behavior
test: add property-based tests for PatchCommandEncoder encode/apply round-trip and determinism
test: add generated stemmer-trie properties ensuring returned patches reconstruct only acceptable stems
test: introduce bounded reusable jqwik generators and scenario builders for maintainable property coverage
build: add jqwik to test dependencies and integrate it with the existing JUnit Platform setup
test: replace Jupiter display and tag annotations in jqwik suites with jqwik-native metadata to remove discovery warnings

gradle/libs.versions.toml

@@ -1,12 +1,14 @@
 #
 # After changing dependency versions:
 #
+# unlock temporarily: LockMode.STRICT -> LockMode.LENIENT
+#
+# refresh verification metadata:
+#     ./gradlew --write-verification-metadata sha256 test jmh distZip cyclonedxBom
+#
 # run:
 #     ./gradlew --write-locks classes testClasses jmh distZip cyclonedxBom
 #
-# if needed, refresh verification metadata:
-#     ./gradlew --write-verification-metadata sha256 test jmh distZip cyclonedxBom
-#
 # (optional - for Eclipse IDE)
 # insert trusted-artifacts into gradle/verification-metadata.xml/verification-metadata/configuration:
 #     <trusted-artifacts>
@@ -21,6 +23,7 @@
 [versions]
 junit = "5.14.3"
 mockito = "5.23.0"
+jqwik = "1.9.3"
 
 [libraries]
 junit-bom = { module = "org.junit:junit-bom", version.ref = "junit" }
@@ -29,3 +32,5 @@ junit-platform-launcher = { module = "org.junit.platform:junit-platform-launcher
 
 mockito-core = { module = "org.mockito:mockito-core", version.ref = "mockito" }
 mockito-junit-jupiter = { module = "org.mockito:mockito-junit-jupiter", version.ref = "mockito" }
+
+jqwik = { module = "net.jqwik:jqwik", version.ref = "jqwik" }