Correct the docs that said this repo has no publishing targets

Both CLAUDE.md and README.md claimed there were deliberately no build or
push targets because the workflow owned publishing. That stopped being true
in 69fcc24, which moved publishing onto the Makefile so release.yaml could
call it — the docs described the arrangement that change replaced.

The claim was wrong in its reasoning too, not just out of date. It was
written on the assumption that riksdata and rd-web duplicated their
pipelines by having those targets. They never did: their workflows call
make and always have, which is what makes a green gate locally and a green
pipeline the same code instead of two descriptions of it. This repo was the
exception, for the single day it had a Makefile that nothing called.

Claude-Session: https://claude.ai/code/session_01S7R4gWTz5wh5xCY4nCSJjN

README.md

@@ -695,10 +695,17 @@ different answers — chart 0.9.0 went out reading `appVersion: "latest"` that w
 publisher, triggered by the tag (`766f439`). The cost is that a chart-only change has no
 version of its own and rides the next app tag.
 
-There is deliberately **no** `make build` / `make push`. The workflow builds
-`linux/amd64,linux/arm64` through buildx; a local single-platform push would land on top of
-the multi-arch tag and stay invisible, because the tag would still resolve — just not on
-arm64. Publishing happens by pushing a tag.
+Both workflows are thin drivers over the Makefile: `ci.yaml` runs `make fmt lint test` and
+`make helm-lint`, `release.yaml` adds `make binaries`, `make push`, `make helm-package` and
+`make helm-push`. That is deliberate — it is what makes a green local gate and a green
+pipeline the same code rather than two descriptions of it, and it is how riksdata and rd-web
+have always worked.
+
+`make push` builds and pushes in one step, unlike those two, because the image is
+`linux/amd64,linux/arm64` and buildx cannot load a multi-platform result into the local image
+store. `make build` stays single-platform and local-only. Both refuse `VERSION=dev`:
+publishing is one command, so it is also one command to run by accident. Publishing happens
+by pushing a tag.
 
 Two things the release process needs to know about this repo: