Add CLAUDE.md for AI assistant context #2222

Job	Run time
windows_test	2m 42s
compile_and_lint	1m 52s
docker_build (linux/amd64, minimal)	4m 54s
test (postgres, postgres, postgres://root:Password123!@127.0.0.1/sqlpage)	1m 48s
docker_build (linux/arm64, minimal)	5m 26s
docker_build (linux/amd64, duckdb)	5m 17s
test (odbc, postgres, Driver=PostgreSQL Unicode;Server=127.0.0.1;Port=5432;Database=sqlpage;UID=r...	2m 9s
test (oracle, oracle, Driver=Oracle 21 ODBC driver;Dbq=//127.0.0.1:1521/FREEPDB1;Uid=root;Pwd=Pas...	2m 40s
test (mysql, mysql, mysql://root:Password123!@127.0.0.1/sqlpage)	1m 27s
docker_build (linux/arm64, duckdb)	5m 33s
docker_build (linux/arm/v7, minimal)	5m 6s
test (mssql, mssql, mssql://root:Password123!@127.0.0.1/sqlpage)	2m 17s
docker_push	0s
	41m 11s

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