feat(sdk): portable Argus CLI — pip install, Docker execution, MCP server, CI preflight #219

Job	Run time
Resolve image matrix	5s
Build Images (cli, docker/Dockerfile.cli, .)	1m 4s
Build Images (scanner-opengrep, docker/Dockerfile.opengrep, .)	21s
Build Images (scanner-bandit, docker/Dockerfile.bandit, .)	19s
Build Images (scanner-supply-chain, docker/Dockerfile.supply-chain, .)	20s
Test Argus CLI	1m 15s
Scan scanner-bandit	1m 22s
Scan scanner-opengrep	1m 38s
Scan cli	1m 35s
Scan scanner-supply-chain	1m 14s
Container Scan Summary	10s
	9m 23s

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