Symlink CLAUDE.md to AGENTS.md, improve doc read tracking (#490) #6031

Job	Run time
build-and-check	3m 14s
test-integration-packages/internal	1m 8s
test-integration-packages/billing	1m 4s
test-integration-sdk	1m 30s
test-integration-web	50s
test-integration-packages/agent-runtime	41s
test-integration-common	39s
test-.agents	45s
test-sdk	47s
test-packages/agent-runtime	50s
test-integration-cli	45s
test-web	48s
test-common	45s
test-packages/billing	46s
test-cli	52s
test-packages/internal	52s
	16m 16s

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