Add runtime version reporting

README.md

@@ -1,10 +1,11 @@
 # ReleaseKit
 
 ReleaseKit is an opinionated Go library and executable for a shared release
-process. The Go module and documented root `releasekit` facade are established;
-the library operations, runtime version package, executable, tests, and release
-automation remain to be implemented. Their selected behavior and sequence are
-described in the [product roadmap](docs/roadmap/releasekit.md) and
+process. The Go module, root `releasekit` facade, `buildinfo` runtime package,
+and `releasekit version` command are established; the library operations beyond
+runtime version access, remaining CLI commands, and release automation remain
+to be implemented. Their selected behavior and sequence are described in the
+[product roadmap](docs/roadmap/releasekit.md) and
 [implementation plan](docs/roadmap/implementation.md).
 
 Run the offline Go test suite from the repository root with:
@@ -13,6 +14,12 @@ Run the offline Go test suite from the repository root with:
 go test ./...
 ```
 
+The current command prints ReleaseKit's version:
+
+```sh
+go run ./cmd/releasekit version
+```
+
 ## Documentation
 
 - [ReleaseKit proposal](docs/roadmap/releasekit.md): proposed publication, builds,
@@ -21,6 +28,8 @@ go test ./...
   policy reading.
 - [Architecture policy](docs/policy/architecture.md): responsibility and dependency
   boundaries for development.
+- [Runtime version guidance](docs/runtime.md): how applications read their
+  embedded version through `buildinfo`.
 - [ADR 0001](docs/adr/0001-public-facade.md): the accepted public facade decision.
 - [Policy adoption roadmap](docs/roadmap/policy.md): completed adoption and pending
   release bootstrap work.