feat: add deterministic compiled-trie artifact regression tooling

test: add deterministic regression coverage for compiled trie artifacts
test: add golden artifact resources and SHA-256 sidecar validation
test: add compiled trie artifact generator utility for regression preparation
build: add Gradle task for regression artifact generation
chore: add bash script to generate golden compiled trie regression files
fix: normalize SHA-256 sidecar output to use artifact basename only
fix: harden test resource loading for regression classpath access
fix: reconstruct stems from patch commands in golden artifact semantic probes

src/test/resources/regression/golden/branching-en-ranked-no-storeorig.gz.sha256

@@ -0,0 +1 @@
+62f6419ebab324a69e2e4ef9753687326aa20eed4e851a0f2b63a10f50d2eaae  branching-en-ranked-no-storeorig.gz

src/test/resources/regression/golden/mini-en-ranked-storeorig.gz.sha256

@@ -0,0 +1 @@
+7b65be9ed9ffab418ed2d1fccc219ea6925e192aa27cdefe5c8383570becd28f  mini-en-ranked-storeorig.gz

src/test/resources/regression/golden/mini-en-unordered-storeorig.gz.sha256

@@ -0,0 +1 @@
+7b65be9ed9ffab418ed2d1fccc219ea6925e192aa27cdefe5c8383570becd28f  mini-en-unordered-storeorig.gz

src/test/resources/regression/sources/branching-en.stemmer

@@ -0,0 +1,5 @@
+# Focused on subtree branching and repeated suffix families
+connect connected connecting connects connection
+collect collected collecting collects collection
+inspect inspected inspecting inspects inspection
+direct directed directing directs direction

src/test/resources/regression/sources/mini-en.stemmer

@@ -0,0 +1,6 @@
+# Basic English sample with remarks and mixed suffix patterns
+run running runs runner
+study studies studying
+city cities
+fly flies flying
+stop stopped stopping stops