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/fixtures/normal_data.csv

@@ -0,0 +1,21 @@
+group,value
+A,10.5
+A,11.2
+A,9.8
+A,10.1
+A,11.5
+A,10.8
+A,9.5
+A,10.3
+A,11.0
+A,10.6
+B,12.3
+B,13.1
+B,11.8
+B,12.5
+B,13.0
+B,12.1
+B,11.5
+B,12.8
+B,13.2
+B,12.0

r-statistics-service/tests/fixtures/sample_t_test.csv

@@ -0,0 +1,17 @@
+group,score
+A,23
+A,25
+A,27
+A,22
+A,24
+A,26
+A,21
+A,28
+B,30
+B,32
+B,28
+B,31
+B,29
+B,33
+B,27
+B,35

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
+  }
+}