diff --git a/AGENTS.md b/AGENTS.md
index fd84e06..9b1ce1e 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -30,7 +30,7 @@ Go module `go.auvem.com/corestack`.
 
 - Docs format (the spec `docs check` implements): `docs/docs-format.md`.
 - Decisions live in `docs/adr/`, plans in `docs/plans/`. Records are permanent; never rename them.
-- Add dependencies only to the module that needs them; heavy dependencies go in nested modules (see the [proposed module-boundary ADR](/docs/adr/20261025T214616275Z-version-light-core-packages-in-the-root-module-and-nest-heavy-dependency-modules.md)).
+- Add dependencies only to the module that needs them; heavy dependencies go in nested modules (see the [module-boundary ADR](/docs/adr/20261025T214616275Z-version-light-core-packages-in-the-root-module-and-nest-heavy-dependency-modules.md)).
 
 ## Go
 - Default backend language is Go; follow existing package boundaries.
diff --git a/docs/adr/20261025T214616275Z-version-light-core-packages-in-the-root-module-and-nest-heavy-dependency-modules.md b/docs/adr/20261025T214616275Z-version-light-core-packages-in-the-root-module-and-nest-heavy-dependency-modules.md
index 4dce866..628c1ce 100644
--- a/docs/adr/20261025T214616275Z-version-light-core-packages-in-the-root-module-and-nest-heavy-dependency-modules.md
+++ b/docs/adr/20261025T214616275Z-version-light-core-packages-in-the-root-module-and-nest-heavy-dependency-modules.md
@@ -1,8 +1,8 @@
 ---
 title: "Version light core packages in the root module and nest heavy-dependency modules"
 date: 2026-10-25
-status: proposed
-implementation: not-started
+status: accepted
+implementation: implemented
 summary: Keep light core packages on root-module versions and isolate heavy or independently versioned packages in nested modules from their first commit.
 tags:
   - modules
@@ -12,7 +12,8 @@ superseded_by: []
 related: []
 tracking:
   - https://gitea.auvem.com/corestack/go/issues/2
-implemented_by: []
+implemented_by:
+  - https://gitea.auvem.com/corestack/go/pulls/4
 ---
 
 # Version light core packages in the root module and nest heavy-dependency modules
@@ -40,7 +41,7 @@ Choose the mixed boundary: light core packages share the root module; heavy-depe
 * Add dependencies only to the module that needs them. The named core packages remain in the root module; heavy dependencies belong in the relevant nested module.
 * Keep `cmd/docs` in the root module. The [release workflow](/.gitea/workflows/release.yml) listens only for plain `v*` tags, and [GoReleaser](/.goreleaser.yaml) builds `./cmd/docs`, so only root-module tags publish binaries. Prefixed library tags never publish binaries.
 
-This proposal records the boundary before the planned packages are added; it does not create empty modules or change the current release configuration.
+This decision establishes the boundary before the planned packages are added. The rule is implemented in [AGENTS.md](/AGENTS.md), and the existing release configuration already follows it. Future packages apply the rule when introduced; no empty modules are needed.
 
 ### Consequences