Symlink CLAUDE.md to AGENTS.md, improve doc read tracking #6030

Job	Run time
build-and-check	3m 8s
test-integration-packages/billing	1m 13s
test-integration-packages/internal	1m 31s
test-integration-cli	41s
test-integration-sdk	2m 43s
test-packages/agent-runtime	48s
test-integration-common	44s
test-cli	58s
test-packages/billing	46s
test-integration-packages/agent-runtime	42s
test-web	51s
test-integration-web	46s
test-sdk	52s
test-packages/internal	56s
test-common	53s
test-.agents	44s
	18m 16s

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