Guard CharBoard placements against invalid indexes

[RainRat]

Summary

• add bounds validation to CharBoard::set_piece and surface failures to callers
• reject overflowing file counters in fill_char_board before attempting to write
• exercise malformed FEN rows with excessive empty counts in the Python tests

Testing

• python3 test.py (fails: ModuleNotFoundError: No module named 'pyffish')
• python3 -m pip install . (fails: blocked from downloading build dependencies in this environment)

---

https://chatgpt.com/codex/tasks/task_e_68ce1a571db48330a1210bf7db6d89d2

[RainRat]

@codex Please fix the build test

[chatgpt-codex-connector]

Summary

• Exposed the complete set of FEN validation error codes (including the board-geometry failure) through the pyffish module so Python callers can assert on the precise validation outcome. src/pyffish.cppL464-L479

Testing

• ✅ python3 test.py

View task →