docs(README): visual refresh + supply-chain badges (#171) #221

Job	Run time
Semgrep (SAST)	23s
Gitleaks (secret scan)	14s
Trivy (filesystem + container scan)	13s
jscpd (duplication < 3% on touched code)	23s
SBOM (SPDX + CycloneDX)	14s
OSV-Scanner (SCA)	5s
	1m 32s

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