Have Spiral Pips start anywhere in outer ring

[samyaksingh2004]

Was playing around with the catanatron env when I faced the same issue. Looked at the original draft PR for this issue: #364 and added some changes and tests to check the proper functionality.

Summary

• Allow official_spiral number placement to start at any random outer corner.
• Filter outer ring coordinates mathematically to guarantee starting on a valid corner.

Testing

• python -m pytest tests/models/ -q
• Added regression test test_spiral_starts_at_random_corners to verify multiple unique corner starts.
• Ran local UI visualizer to ensure red number isolation remains intact.

[netlify]

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