Add instance command registry and composition

docs/development.md

@@ -1,9 +1,9 @@
 # Developing CommandKit
 
 CommandKit currently contains adopted repository policies, accepted architectural
-decisions, implementation plans, and initial Go identity and outcome primitives.
-Command dispatch is not implemented yet. The [README](../README.md) provides
-project orientation; the
+decisions, implementation plans, identity and outcome primitives, typed command
+declarations, and an instance-owned registry. Command execution is not implemented
+yet. The [README](../README.md) provides project orientation; the
 [documentation policy](policy/documentation.md#canonical-ownership) assigns
 canonical documentation owners.
 

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # Initial CommandKit implementation plan
 
-Status: implementation underway; Stage 1 complete and Stages 2-14 pending.
+Status: implementation underway; Stages 1-2 complete and Stages 3-14 pending.
 
 Date: 2026-10-07.
 
@@ -169,7 +169,7 @@ Verified with `go test ./...`, `go mod verify`, and
 
 ## Stage 2: implement the instance registry and command declarations
 
-**Status:** pending. **Prerequisite:** Stage 1.
+**Status:** complete. **Prerequisite:** Stage 1.
 
 Implement `App`, opaque `Command`, metadata, group composition, and registration
 in root files such as `app.go`, `command.go`, and `registry.go`.
@@ -234,6 +234,9 @@ package or exported bridge methods.
 registries; duplicate nested paths; runnable-parent composition; registration errors
 leave the previous inventory intact. Execution remains Stage 5 work.
 
+**Completion:** added typed command declarations, group composition, root help and
+version reservations, and atomic per-App registration. Verified with `go test ./...`.
+
 ## Stage 3: implement typed bindings and input assembly
 
 **Status:** pending. **Prerequisite:** Stage 2.