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docs: restructure AGENTS.md into a contract over .agents/ pages (#388) #1335

Job	Run time
runtime (bun)	49s
unit-test / test (ubuntu-latest, 24)	2m 50s
runtime (deno)	49s
e2e	3m 1s
unit-test / test (windows-latest, 24)	4m 26s
unit-test / test (ubuntu-latest, 22)	3m 5s
unit-test / test (ubuntu-latest, 26)	2m 47s
unit-test / test (windows-latest, 26)	4m 11s
unit-test / test (windows-latest, 22)	5m 7s
unit-test / lint	1m 56s
	29m 1s