refactor(monorepo): remove legacy root runtime ownership

docs/roadmaps/archive/skill-workspace-monorepo-migration.md

@@ -2,7 +2,7 @@
 
 ## Status
 
-- `in_progress`
+- `completed`
 
 ## Owner
 
@@ -30,11 +30,11 @@
 - [x] Phase 3: extract `inbox-runtime` and `orch-runtime`
 - [x] Phase 4: extract `orchd-runtime`
 - [x] Phase 5: import `repo-memory-runtime` and add `skills/repo-memory`
-- [ ] Phase 6: remove root runtime ownership and normalize package-based packaging
+- [x] Phase 6: remove root runtime ownership and normalize package-based packaging
 
 ## Files
 
-- `docs/roadmaps/active/skill-workspace-monorepo-migration.md`
+- `docs/roadmaps/archive/skill-workspace-monorepo-migration.md`
 - `docs/skill-workspace-monorepo.md`
 - `docs/implementation-roadmap.md`
 - `go.work`
@@ -54,4 +54,12 @@
 
 ## Next Step
 
-- start Phase 6 by removing or reducing legacy root runtime ownership now that `coord-core`, `inbox-runtime`, `orch-runtime`, `orchd-runtime`, and `repo-memory-runtime` all exist as package-owned runtimes
+- resume product work on top of the package-owned runtime workspace, starting with whichever user-facing feature slice has priority next
+
+## Completion Summary
+
+- bootstrapped the repository as a multi-package workspace with `go.work`, expanded JS workspace discovery, and declarative skill bundle metadata
+- extracted the shared coordination kernel into `packages/coord-core`
+- extracted package-owned runtimes for `inbox`, `orch`, `orchd`, and `repo-memory`
+- switched the root skill packaging flow to build from package entrypoints, including the new `repo-memory` bundle
+- removed the legacy root runtime implementation directories under `internal/`, leaving root `cmd/*` as compatibility shims while package-owned runtimes remain the source of truth