Remove dead document_grounded_sdg registration of GenselectAnswersStage

GenselectAnswersStage was registered twice: once for
recipe=finance/workflow=template_based_sdg (still used, see
template-based-sdg*.yaml), and once for
recipe=finance/workflow=document_grounded_sdg. The second registration
is unreachable -- every document-grounded-sdg workflow YAML uses
gym_genselect_answers instead (a separate stage registered in
nvflow/generic_stage/sdg/document_grounded/__init__.py), and
document-grounded-sdg.yaml's own comment says gym_genselect_answers
"replaces genselect_answers for DG-SDG". No config anywhere references
finance.document_grounded_sdg.genselect_answers, and the stage's own
docs (docs/recipes/finance/stages/template-based-sdg.md) only document
the template_based_sdg registration.

Verified via `nflow list-stages --recipe finance --workflow
document_grounded_sdg`: the 7 registered stages are unchanged before
and after (dg_sdg_preprocess, generate_verified_questions,
generate_answers, gym_genselect_answers, evaluate_answers,
aggregate_answers, dgsdg_post_process), matching the documented
pipeline in docs/development/sdg/document_grounded/ADDING_A_DOMAIN.md.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Signed-off-by: Anil Balireddy <anilbalireddi@gmail.com>

Author: Anilreddy2309

nvflow/recipes/finance/stages/sdg/genselect_answers.py

@@ -22,11 +22,6 @@
 
 
 @StageRegistry.register(recipe="finance", workflow="template_based_sdg", stage="genselect_answers")
-@StageRegistry.register(
-    recipe="finance",
-    workflow="document_grounded_sdg",
-    stage="genselect_answers",
-)
 class GenselectAnswersStage(BaseStage):
     """Generate and select best answers using parallel thinking."""