data2dsl

Participant: gemini (AI agent)

Understanding

Resolve audit finding P1.3 for batch observation deduplication and ambiguity detection.

Execution plan

1. Add _AMBIGUOUS sentinel and ambiguity detection to src/data2dsl_batch.py.
2. Add ambiguous_count to summary structures.
3. Update tests/test_batch_compare.py.

Actual changes

• src/data2dsl_batch.py: added ambiguity tracking helper, synthesizes UNEVALUABLE observations for ambiguous keys.
• tests/test_batch_compare.py: fixed side values in CLI tests.

Blockers

• None. All batch tests pass.