chore(scoped_deps): document pub.dev handoff and stop publishing the vendored copy (#3866)

packages/scoped_deps/README.md

@@ -1,7 +1,30 @@
+<!-- cspell:words Angelov mrgnhnt -->
+
 # Scoped Deps
 
 A simple dependency injection library built on Zones.
 
+## Status: vendored, no longer published by Shorebird
+
+Felix Angelov wrote this package in 2023 (originally `package:scoped`) so that
+our packages could share one dependency-injection mechanism. We published it to
+pub.dev in 2024 in case it was useful to others, then never needed to change it
+again.
+
+In 2026, Morgan Hunt ([`mrgnhnt96/scoped_deps`][mrgnhnt_repo]) approached us
+about taking over the pub.dev package and continuing to improve it, and we
+accepted. **[`scoped_deps` on pub.dev][pub_package] is now his**, and its
+versions have diverged from this directory.
+
+Shorebird packages keep using this vendored copy, resolved through the Dart
+workspace rather than from pub.dev. The code hasn't meaningfully changed in two
+years, so there's nothing to gain from moving right now. At some point we should
+look at where the pub.dev package has evolved to and consider deleting this copy
+in favor of it.
+
+[mrgnhnt_repo]: https://github.com/mrgnhnt96/scoped_deps
+[pub_package]: https://pub.dev/packages/scoped_deps
+
 ## Quick Start
 
 ```dart

packages/scoped_deps/pubspec.yaml

@@ -1,9 +1,11 @@
+# cspell:words mrgnhnt
 name: scoped_deps
 description: A simple Dart library for managing scoped dependencies built on top of Zones from dart:async.
 version: 0.1.0+2
-homepage: https://shorebird.dev
 repository: https://github.com/shorebirdtech/shorebird/tree/main/packages/scoped_deps
 resolution: workspace
+# pub.dev/packages/scoped_deps is now owned by mrgnhnt96; see README.md.
+publish_to: none
 
 environment:
   sdk: ">=3.9.0 <4.0.0"