104 Add Grid model and segment_strokes utility function #305

Job	Run time
mypy	26s
ruff	11s
unit (macos-latest, 3.11, lowest-direct)	2m 51s
unit (windows-latest, 3.12, highest)	2m 47s
unit (windows-latest, 3.12, lowest-direct)	3m 3s
unit (macos-latest, 3.11, highest)	2m 16s
unit (ubuntu-latest, 3.13, highest)	2m 39s
unit (windows-latest, 3.13, lowest-direct)	3m 6s
unit (ubuntu-latest, 3.13, lowest-direct)	2m 32s
unit (ubuntu-latest, 3.12, highest)	2m 25s
unit (windows-latest, 3.11, lowest-direct)	2m 38s
unit (windows-latest, 3.11, highest)	2m 38s
unit (macos-latest, 3.13, highest)	2m 8s
unit (macos-latest, 3.12, lowest-direct)	1m 48s
unit (ubuntu-latest, 3.11, highest)	2m 12s
unit (ubuntu-latest, 3.11, lowest-direct)	2m 19s
unit (macos-latest, 3.12, highest)	1m 51s
unit (windows-latest, 3.13, highest)	2m 50s
unit (ubuntu-latest, 3.12, lowest-direct)	2m 29s
unit (macos-latest, 3.13, lowest-direct)	1m 48s
coverage	11s
	45m 8s

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