Expand Python Integration Test Coverage

[smly]

Expand Python-side integration tests to verify correctness across full game progressions.

• End-to-end Hanchan/Tonpusen simulation tests with final score verification
• Tests for all draw types (Kyuushu Kyuuhai, Suufon Renda, Suukaikan, Sanchaho, Suucha Riichi)
• Per-rule-preset (Tenhou / MajSoul) differential tests
• Expanded integration tests for Sanma-specific rules (Kita, no Chi, tile set restrictions)
• Replay parity tests: Verify event sequence matching against real game logs

Optional:

• CI integration for test coverage measurement (cargo-tarpaulin / pytest-cov)