Add stringent unit tests for legacy ciphers (TEA, RedPike, AveMaria)

[SWORDIntel]

Motivation

• Increase regression coverage for recently added legacy ciphers and catch subtle implementation regressions early.
• Verify determinism and reversible behavior of AveMariaCipher across cycle and fixed table modes.
• Provide an explicit test path for KASUMI presence so the suite documents whether the symbol is implemented or should be skipped.

Description

• Added tests/unit/test_new_ciphers.py which includes a 256-iteration randomized roundtrip matrix for TEA and RedPike.
• Added deterministic/roundtrip differentiation checks for AveMariaCipher ensuring cycle and fixed outputs differ and both decrypt correctly.
• Added a passthrough safety test that ensures malformed or unknown AveMaria token groups remain unchanged on decrypt.
• Added a conditional check that validates the KASUMI symbol when present and otherwise emits an explicit pytest.skip documenting current implementation status.

Testing

• Ran python -m pytest -q tests/unit/test_new_ciphers.py tests/unit/test_ave_maria_cipher.py tests/unit/test_legacy_ciphers.py.
• Result: 15 passed, 1 skipped (all new tests passed or skipped as intended).

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