chore: delete parity harness (#172) #223

Job	Run time
jscpd (duplication < 3% on touched code)	17s
Trivy (filesystem + container scan)	14s
Gitleaks (secret scan)	13s
OSV-Scanner (SCA)	6s
SBOM (SPDX + CycloneDX)	23s
Semgrep (SAST)	23s
	1m 36s

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