chore: track Cursor agent rules in git #82

Job	Run time
Playwright Vite dogfood fixture	57s
e2e	1m 20s
smoke (config + lint + tts dry-run)	18s
lint	9s
unit (3.10)	1m 30s
unit (3.12)	1m 19s
unit (3.11)	1m 10s
	6m 43s

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