feat(ssa): Complete T-test end-to-end testing with 9 bug fixes - Phase 1 core 85% complete. R service: missing value auto-filter. Backend: error handling, variable matching, dynamic filename. Frontend: module activation, session isolation, error propagation. Full flow verified.

Co-authored-by: Cursor <cursoragent@cursor.com>

r-statistics-service/tests/test_t_test.json

@@ -0,0 +1,16 @@
+{
+  "data_source": {
+    "type": "inline",
+    "data": {
+      "group": ["A", "A", "A", "A", "A", "A", "A", "A", "B", "B", "B", "B", "B", "B", "B", "B"],
+      "score": [23, 25, 27, 22, 24, 26, 21, 28, 30, 32, 28, 31, 29, 33, 27, 35]
+    }
+  },
+  "params": {
+    "group_var": "group",
+    "value_var": "score"
+  },
+  "guardrails": {
+    "check_normality": true
+  }
+}