feat(eval): retrieval quality harness (recall@k / nDCG / MRR) + product audit #1018

Job	Run time
Security scan (govulncheck)	25s
Bug hunt tag check (PR)	7s
Helm chart lint	11s
Trivy image scan (API + Worker)	1m 53s
golangci-lint	1m 8s
Go build, vet & test + coverage	2m 22s
Massive / realistic workload tests	21s
Bug hunt (daily)	0s
Integration E2E (docker compose + OpenAI)	3m 51s
Massive workload via HTTP (docker compose)	1m 58s
Integration graph (complete AGE matrix)	1m 32s
Retrieval quality eval (recall@k / nDCG)	2m 47s
Integration smoke (Postgres + Redis)	0s
	16m 35s

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