Explicit test coverage for Copilot noreply bot email format + README git hooks install instructions

README.md

@@ -1,5 +1,21 @@
 # Config Files
 
+## Git Hooks
+
+Strips AI-generated trailers (e.g. `Co-authored-by: Copilot`) from commit messages automatically.
+
+**macOS / Linux:**
+
+```bash
+bash git-hooks/install.sh
+```
+
+**Windows (PowerShell):**
+
+```powershell
+powershell -ExecutionPolicy Bypass -File git-hooks/install.ps1
+```
+
 ## Winget Config instructions
 
 1. Take the desired configuration scripts from the [winget_configurations folder](./winget_configurations)

git-hooks/tests/commit-msg.Tests.ps1

@@ -112,6 +112,13 @@ Describe 'Remove-AITrailers' {
             $result = Remove-AITrailers -Lines $lines
             $result | Should -Not -Match 'co-authored-by'
         }
+
+        It 'removes Co-authored-by: Copilot with GitHub noreply bot email' {
+            $lines = @('Fix bug', '', 'Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>')
+            $result = @(Remove-AITrailers -Lines $lines)
+            $result | Should -Not -Match 'Co-authored-by'
+            $result[0] | Should -Be 'Fix bug'
+        }
     }
 
     Context 'Claude / Anthropic Co-authored-by is removed' {
@@ -384,6 +391,13 @@ Describe 'commit-msg bash hook (end-to-end)' -Skip:($IsWindows -or -not (Get-Com
         $result.Trim() | Should -Be 'Fix bug'
     }
 
+    It 'removes Copilot trailer with GitHub noreply bot email' {
+        $content = "Fix bug`n`nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>`n"
+        $result = Invoke-BashHook $content
+        $result | Should -Not -Match 'Co-authored-by'
+        $result.Trim() | Should -Be 'Fix bug'
+    }
+
     It 'removes Claude trailer by email domain' {
         $content = "Fix bug`n`nCo-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>`n"
         $result = Invoke-BashHook $content