Remove disabled_mcp_servers + internalize env_value_mode (cross-SDK p… #84

Job	Run time
Rust SDK Bundled CLI Build (macos-latest)	4m 7s
Rust SDK Bundled CLI Build (ubuntu-latest)	3m 10s
Rust SDK Tests (ubuntu-latest)	2m 6s
Rust SDK Tests (windows-latest)	2m 24s
Rust SDK Bundled CLI Build (windows-latest)	3m 36s
Rust SDK Tests (macos-latest)	1m 15s
	16m 38s

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