feat: Phase 2 complete — 13 Phases of COBOL type classification and test benchmark

P0.6: gcov infrastructure
P1: extract_structure output expansion (11 new feature fields)
P2: Confusion group rule engine (8 pairs + contradiction + backtrack)
P3: 4-factor confidence calculation + quality gate update
P4: 33+2 COBOL program type test samples (22 files, 7 categories)
P5: parametrized/ test data generation engine
P6: japanese_data.py lookup tables
P7-10: Type-specific test suites (~159 parametrized tests)
P11: Full classification pipeline (classify_program) + orchestrator integration
P12: Documentation (module-interfaces, test-plan v3.0, coverage-matrix)

Architecture decisions:
- classification_pipeline/ merged to hina/pipeline/
- parametrized/ as independent module
- japanese_data.py as root-level file
- hina/__all__ only exports classify_program()

Co-Authored-By: Claude <noreply@anthropic.com>

tests/fixtures/java/pom.xml

@@ -0,0 +1 @@
+<project><modelVersion>4.0.0</modelVersion><groupId>test</groupId><artifactId>test</artifactId><version>1.0</version></project>

tests/fixtures/java/src/main/java/coboljava/Simple.java

@@ -0,0 +1,8 @@
+package coboljava;
+public class Simple {
+    public static void main(String[] args) {
+        System.out.println("BR-AMT (S9(7)V99): 1500.00");
+        System.out.println("BR-STATUS (X): A");
+        System.out.println("BR-DATE (9(8)): 20260522");
+    }
+}