Go envelope v1.182
Security rebuild of the Go envelope from protected main for JANUS-439.
- builds with Go 1.26.6, fixing GO-2026-6218 in net/url and GO-2026-6091 in html/template
- retains the in-product Knowledge section delivered in v1.181
- keeps govulncheck on both pull requests and pushes to main
- signed image, SBOM, provenance, scanner summary, and production admission receipt are produced by the release workflow
Production promotion is pending the exact released digest and the reviewed nixcfg pin/deploy path.