feat: phase2 review fixes

- TIME injection: change from spaces to '2500' (hour>23) for NUMVAL trigger
- Runner: add .resolve() to work_dir to fix chdir+relative path breakage
- Coverage: per-target field overrides for DP#9-#12 (START-DATE=20240115 etc.)
- .gitignore: add compilation artifacts, temp scripts, test outputs

cobol_testgen/pipeline_bridge.py

@@ -180,5 +180,10 @@ def _assigns_list_to_dict(assigns_list: list) -> dict:
         tgt = a.get("tgt", "")
         src = a.get("src") or a.get("source_vars")
         if tgt and src:
-            result[tgt] = [a]
+            a_norm = dict(a)
+            if 'type' in a_norm:
+                a_norm['type'] = a_norm['type'].lower()
+            if 'src' in a_norm and not a_norm.get('source_vars'):
+                a_norm['source_vars'] = [a_norm['src']]
+            result[tgt] = [a_norm]
     return result