feat(sdk): portable Argus CLI — pip install, Docker execution, MCP server, CI preflight #8

Job	Run time
Build Images (scanner-bandit, docker/Dockerfile.bandit)	22s
Build Images (cli, docker/Dockerfile.cli)	1m 8s
Build Images (scanner-opengrep, docker/Dockerfile.opengrep)	19s
Build Images (scanner-supply-chain, docker/Dockerfile.supply-chain)	21s
Test Argus CLI	1m 29s
Scan scanner-bandit	1m 6s
Scan scanner-opengrep	1m 5s
Scan scanner-supply-chain	1m 12s
Scan cli	1m 25s
Container Scan Summary	5s
	8m 32s

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