fix(simulation): export ACTIVE valves correctly for EPANET 2

The legacy online simulation path still exported internal ACTIVE states as STATUS keywords, which EPANET 2 rejects. Preserve numeric settings and EPANET 3 output while passing the format through both exporters. Surface the original engine error inside the model transaction so failed runs roll back before result storage.

Regression guard: six failures reproduced on the deployed baseline, including native input validation. All 34 focused export, service and endpoint checks pass after the fix; the real project also returns native node and link results.

app/native/wndb/inp/exporter.py

@@ -120,7 +120,7 @@ def dump_inp(project: str, inp: str, version: str = '3'):
             file.write('\n'.join(inp_out_demand(project)))
 
         elif name == STATUS:
-            file.write('\n'.join(inp_out_status(project)))
+            file.write('\n'.join(inp_out_status(project, version=version)))
 
         elif name == PATTERNS:
             if version == '3':
@@ -232,7 +232,7 @@ def export_inp(project: str, version: str = '3') -> ChangeSet:
             inp += '\n'.join(inp_out_demand(project))
 
         elif name == STATUS:
-            inp += '\n'.join(inp_out_status(project))
+            inp += '\n'.join(inp_out_status(project, version=version))
 
         elif name == PATTERNS:
             if version == '3':