Add README, LICENSE, Makefile, Dockerfile, and CI
Add a detailed README, WTFPL LICENSE, and build/CI tooling modeled on the vaultik repo (Makefile, multi-stage digest-pinned Dockerfile, .gitea/workflows/check.yml). Bump Go to 1.26.4 and pin golangci-lint to v2.12.2. gofmt existing sources so the new fmt-check gate passes.
This commit is contained in: