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

build.gradle

@@ -70,6 +70,7 @@ dependencies {
 
     testImplementation libs.mockito.core
     testImplementation libs.mockito.junit.jupiter
+    testImplementation libs.jqwik
     
     mockitoAgent(libs.mockito.core) {
         transitive = false