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docs: restructure AGENTS.md into a contract over .agents/ pages #1334

Job	Run time
e2e	2m 29s
runtime (bun)	46s
unit-test / test (ubuntu-latest, 26)	2m 28s
runtime (deno)	54s
unit-test / lint	2m 16s
unit-test / test (ubuntu-latest, 22)	3m 5s
unit-test / test (ubuntu-latest, 24)	2m 45s
unit-test / test (windows-latest, 26)	4m 10s
unit-test / test (windows-latest, 24)	3m 38s
unit-test / test (windows-latest, 22)	4m 3s
	26m 34s