ci+docs(perf-gate): enrich memory regression gate + OOM-fix evidence … #174

Job	Run time
Semgrep (SAST)	23s
Gitleaks (secret scan)	13s
OSV-Scanner (SCA)	5s
Trivy (filesystem + container scan)	15s
jscpd (duplication < 3% on touched code)	16s
SBOM (SPDX + CycloneDX)	16s
	1m 28s

Provide feedback