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No, it was 1.6 that was on the Steam beta. That was years before HL2 and CS:S were even leaked let alone released.

Not sure of the exact history but pretty sure Steam was launched as a beta in 2002, or maybe 2003. In September 2003 or so the database was wiped and Steam was launched, again with probably only Counter-Strike available.

Counter-Strike Source was launched some time in 2004 and then Half-Life 2 came along in November 2004.

Steam dropped basically alongside team fortress.