Consolidate synthetic scene helpers

[jwalin-shah]

Summary

• Extract shared colored-object scene generation, pairwise spatial facts, TL derived-state construction, and object-fact retraction into tensor_logic.research.synthetic_scene.
• Route exp79 and exp83 through the canonical helper while preserving their old function names for existing scripts/tests.
• Add tests that prove both experiment call paths use the canonical implementation and validate the retraction rule behavior.

Validation

• PASS: python3 -m pytest tests/test_synthetic_scene_helpers.py tests/test_exp79.py -q
• PASS: git diff --check
• FAIL: python3 -m pytest -q
  • Existing unrelated failures in tests/test_tensor_logic_core.py::TensorLogicCoreTest::test_query_rejects_wrong_arity_and_unknown_symbols and ::test_recursive_query_rejects_wrong_arity.
  • The implementation raises "relation 'edge' expects 2 args, got N" while those assertions expect "edge expects 2 symbols, got N".

Residual Risk

• Full-suite failure is outside this duplicate-helper surface and remains unresolved in this PR.

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