docs(changelog): cut v0.2.0-beta.6 section #172

Job	Run time
OSV-Scanner (SCA)	6s
jscpd (duplication < 3% on touched code)	16s
SBOM (SPDX + CycloneDX)	22s
Gitleaks (secret scan)	8s
Trivy (filesystem + container scan)	15s
Semgrep (SAST)	30s
	1m 37s

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