chore: fix composite action checkout ordering

Move checkout out of the composite action and back into each workflow.
GitHub needs the repo checked out before it can find local action definitions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: natemcmaster

.github/actions/setup-dotnet/action.yml

@@ -1,17 +1,9 @@
 name: Setup .NET
-description: Checkout the repository and install .NET SDK versions used by this project
-
-inputs:
-  fetch-depth:
-    description: Number of commits to fetch (0 for full history)
-    default: "1"
+description: Install .NET SDK versions used by this project
 
 runs:
   using: composite
   steps:
-    - uses: actions/checkout@v6
-      with:
-        fetch-depth: ${{ inputs.fetch-depth }}
     - name: Setup .NET
       uses: actions/setup-dotnet@v5
       with:

.github/workflows/ci.yml

@@ -33,6 +33,7 @@ jobs:
       package_version: ${{ steps.build_script.outputs.package_version }}
 
     steps:
+      - uses: actions/checkout@v6
       - uses: ./.github/actions/setup-dotnet
       - name: Run build script
         id: build_script

.github/workflows/claude.yml

@@ -31,6 +31,7 @@ jobs:
       id-token: write
       actions: read # Required for Claude to read CI results on PRs
     steps:
+      - uses: actions/checkout@v6
       - uses: ./.github/actions/setup-dotnet
 
       - name: Run Claude Code

.github/workflows/docs.yml

@@ -20,6 +20,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+    - uses: actions/checkout@v6
     - uses: ./.github/actions/setup-dotnet
     - name: Run docs generation
       run: ./docs/generate.ps1