chore: drop Homebrew + delete stale Java-era docs (CLI + MCP only) (#… #153

Job	Run time
jscpd (duplication < 3% on touched code)	13s
Gitleaks (secret scan)	13s
OSV-Scanner (SCA)	5s
Semgrep (SAST)	23s
SBOM (SPDX + CycloneDX)	14s
Trivy (filesystem + container scan)	14s
	1m 22s

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