test: added test_atomic_io, test_id_map_json, test_domain_types, test…

[Intrinsical-AI]

Test Suite Hardening - Expansion and Refinement

New Test Modules

test_atomic_io.py

• Implementation of roundtrip validation for persistence.
• Edge case handling: empty strings and empty byte sequences.
• Structural validation: automatic creation of parent directories and file overwrite logic.

test_id_map_json.py

• Serialization compatibility: support for Pickle (v2, v4) and JSON.
• Content types: plain text and boundary byte testing.
• State handling: validation of empty mapping structures.

test_domain_types.py

• Prefix logic: default vs. custom prefix resolution.
• Dynamic behavior: runtime type checking and UUID v7 suffix generation.
• Integrity: enforcement of uniqueness constraints.

test_ingestion.py

• default_preprocess: 5 test cases covering transformation variants.
• stable_lineage_metadata: 5 test cases ensuring metadata consistency.

test_frontend_path.py

• Path resolution: returns None when frontend is missing.
• Path resolution: returns absolute path when frontend exists.

Updated Test Modules

test_evaluation.py

• format_eval_result: Added 3 test cases for result formatting logic.

test_utils.py

• Text processing robustness: Unicode spaces and only-unicode-whitespace strings.
• String handling: Newline variants and long string performance/limit tests.