diff --git a/README.md b/README.md
index bec67b0..f02aed6 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,17 @@
 # ReleaseKit
 
-ReleaseKit is being designed as an opinionated Go library and executable for a
-shared release process. The repository currently contains policies, architectural
-decisions, and implementation proposals. Go packages, commands, and release
-automation have not been implemented.
+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
+[implementation plan](docs/roadmap/implementation.md).
+
+Run the offline Go test suite from the repository root with:
+
+```sh
+go test ./...
+```
 
 ## Documentation
 
diff --git a/doc.go b/doc.go
new file mode 100644
index 0000000..a594f18
--- /dev/null
+++ b/doc.go
@@ -0,0 +1,3 @@
+// Package releasekit is the public facade for ReleaseKit's release process.
+// Public operations are added as their behavior is implemented.
+package releasekit
diff --git a/docs/development.md b/docs/development.md
index 03dc976..8e88403 100644
--- a/docs/development.md
+++ b/docs/development.md
@@ -1,8 +1,9 @@
 # Developing ReleaseKit
 
-ReleaseKit currently contains adopted policies and design documents. See the
-[README](../README.md) for orientation and the [product roadmap](roadmap/releasekit.md)
-for proposed capabilities and implementation sequencing.
+ReleaseKit contains a Go module with the documented root `releasekit` facade,
+adopted policies, and design documents. See the [README](../README.md) for
+orientation and the [product roadmap](roadmap/releasekit.md) for proposed
+capabilities and implementation sequencing.
 
 Read the [agent policy](policy/agents.md) and inspect the worktree before editing.
 Preserve unrelated changes and follow explicit instructions about commits.
@@ -35,6 +36,17 @@ documentation topic map.
 
 ## Validation
 
+Run the offline Go test suite from the repository root with:
+
+```sh
+go test ./...
+```
+
+The implemented package inventory currently contains only the root
+`releasekit` facade package. Its public operations are added as their behavior is
+implemented; see the [implementation plan](roadmap/implementation.md) for
+current progress.
+
 For prose changes, review the diff and check local links, fragment destinations,
 provenance, template residue, and consistency with current repository contents.
 Check prose whitespace with:
@@ -47,7 +59,7 @@ git diff --cached --check -- '*.md' COPYRIGHT
 Verbatim license texts retain their supplied formatting. When changing those
 texts, compare their bytes with the selected upstream source.
 
-There is no `go.mod`, default test suite, or publication command yet. Add working
-development commands here as implementation lands. Add `docs/release.md` with
-the first working publication command; the [policy adoption roadmap](roadmap/policy.md#4-define-releasekits-own-release-path)
+There is no publication command yet. Add working development commands here as
+implementation lands. Add `docs/release.md` with the first working publication
+command; the [policy adoption roadmap](roadmap/policy.md#4-define-releasekits-own-release-path)
 records the remaining bootstrap work.
diff --git a/docs/roadmap/implementation.md b/docs/roadmap/implementation.md
index 47f4ddb..9fd1560 100644
--- a/docs/roadmap/implementation.md
+++ b/docs/roadmap/implementation.md
@@ -435,7 +435,7 @@ arbitrary toolchains or elapsed time are not promised.
 
 ## Stage 1: Establish the Go module and development baseline
 
-Status: Pending. Depends on the baseline only.
+Status: Complete. Depends on the baseline only.
 
 1. Add the module with the selected path and language baseline. Add root package
    documentation for the orchestration facade and establish ordinary Go layout.
@@ -448,6 +448,12 @@ Acceptance: module loading and `go test ./...` work with the prepared local
 toolchain and network disabled. Review module identity and licensing notices.
 Do not invent tests merely to assert that an empty package exists.
 
+Completion evidence: added the Go 1.25.0 module and documented root facade,
+updated the README and developer guide to describe the implemented boundary and
+offline test command, and confirmed module loading and `go test ./...` with
+network access disabled. The module has no external dependencies; existing
+LGPL licensing and attribution notices remain consistent.
+
 ## Stage 2: Implement the runtime version facade
 
 Status: Pending. Depends on Stage 1.
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..0c35f27
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module gitea.maximumdirect.net/eric/ReleaseKit
+
+go 1.25.0