fix: align marketplace with MSX plugin layout

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

Author: MariusStorhaug

.github/plugin/README.md

@@ -13,7 +13,7 @@ copilot plugin install psmodule-process
 ```
 
 The plugin provides the
-[`pester-migration`](./plugins/psmodule-process/skills/pester-migration/SKILL.md)
+[`pester-migration`](../../plugins/psmodule-process/skills/pester-migration/SKILL.md)
 skill for migrating every Pester test set in a PSModule repository to Pester
 6.1.0. Verify the installation with:
 
@@ -24,4 +24,4 @@ copilot plugin list
 
 The marketplace manifest is
 [`marketplace.json`](./marketplace.json); plugin metadata is in
-[`plugin.json`](./plugins/psmodule-process/plugin.json).
+[`plugin.json`](../../plugins/psmodule-process/plugin.json).

.github/plugin/marketplace.json

@@ -12,7 +12,7 @@
       "name": "psmodule-process",
       "description": "PSModule process guidance and reusable skills for PowerShell module repositories.",
       "version": "1.0.0",
-      "source": "./plugins/psmodule-process"
+      "source": "plugins/psmodule-process"
     }
   ]
 }

…gin/plugins/psmodule-process/plugin.json plugins/psmodule-process/plugin.json.github/plugin/plugins/psmodule-process/plugin.json renamed to plugins/psmodule-process/plugin.json .github/plugin/plugins/psmodule-process/plugin.json renamed to plugins/psmodule-process/plugin.json

@@ -1,11 +1,13 @@
 {
+  "$schema": "https://agent-plugins.org/schemas/1.0.0/plugin.schema.json",
   "name": "psmodule-process",
   "description": "PSModule process guidance and reusable skills for PowerShell module repositories.",
   "version": "1.0.0",
   "author": {
     "name": "PSModule",
     "url": "https://github.com/PSModule"
   },
+  "homepage": "https://psmodule.io/docs/",
   "repository": "https://github.com/PSModule/Process-PSModule",
   "license": "MIT",
   "keywords": [