refactor: use shared MSX plugin marketplace

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: MariusStorhaug

.github/plugin/README.md

@@ -1,15 +1,15 @@
-# PSModule process marketplace
+# PSModule process plugin
 
-This repository is a GitHub Copilot CLI plugin marketplace. The marketplace
-and its `psmodule-process` plugin are versioned **1.0.0**.
+This repository hosts the canonical `psmodule-process` GitHub Copilot CLI
+plugin. The shared MSXOrg marketplace publishes this plugin alongside the
+other initiative plugins.
 
-## Install
+## Install directly
 
-Add the marketplace and install the plugin:
+Install the plugin directly from this repository:
 
 ```console
-copilot plugin marketplace add PSModule/Process-PSModule
-copilot plugin install psmodule-process
+copilot plugin install PSModule/Process-PSModule:.github/plugin/plugins/psmodule-process
 ```
 
 The plugin provides the
@@ -22,6 +22,7 @@ copilot plugin list
 /skills list
 ```
 
-The marketplace manifest is
-[`marketplace.json`](./marketplace.json); plugin metadata is in
+The shared marketplace is maintained in
+[MSXOrg/docs](https://github.com/MSXOrg/docs/tree/main/.github/plugin).
+Plugin metadata is in
 [`plugin.json`](./plugins/psmodule-process/plugin.json).

.github/plugin/marketplace.json

@@ -5,10 +5,12 @@ description: A repository-wide checklist for migrating PSModule test sets to Pes
 
 # Migrating Pester tests
 
-Install the version 1.0.0 [`psmodule-process` marketplace
-plugin](https://github.com/PSModule/Process-PSModule/tree/main/.github/plugin/marketplace.json)
-and use its reusable `pester-migration` agent skill to migrate every Pester test
-set in a PSModule repository. It is
+Install the `psmodule-process` plugin from the shared
+[MSXOrg marketplace](https://github.com/MSXOrg/docs/tree/main/.github/plugin)
+and use its reusable `pester-migration` agent skill to migrate every Pester
+test set in a PSModule repository. For direct installation during development,
+use `copilot plugin install
+PSModule/Process-PSModule:.github/plugin/plugins/psmodule-process`. It is
 written for Pester **6.1.0** and distinguishes required compatibility changes
 from optional v6 modernization.
 

docs/content/guides/pester-migration.md

@@ -41,7 +41,7 @@ Task-oriented deep dives into the pipeline's functionality.
 | [Structuring your module](guides/structuring-your-module.md) | The repository and module source layout the workflow expects, and how to declare dependencies. |
 | [Writing module tests](guides/writing-module-tests.md) | Test discovery, setup and teardown phases, and shared test infrastructure. |
 | [Migrating Pester tests](guides/pester-migration.md) | A repository-wide checklist for migrating every test set to Pester 6.1.0. |
-| [PSModule process marketplace](https://github.com/PSModule/Process-PSModule/tree/main/.github/plugin) | Install the version 1.0.0 Copilot CLI plugin and its reusable skills. |
+| [PSModule process plugin](https://github.com/PSModule/Process-PSModule/tree/main/.github/plugin) | Install the plugin directly or through the shared MSXOrg marketplace. |
 | [Skipping framework tests](guides/skipping-framework-tests.md) | Skip individual framework tests on a per-file basis. |
 | [Versioning and releases](guides/versioning-and-releases.md) | Label-driven versioning, prereleases, and what a release produces. |
 | [Validating before review](guides/validating-before-review.md) | The PSModule validation pass before a draft pull request is marked ready. |