Support custom GitHub token for branded reviews

Use env.GITHUB_TOKEN if provided by the caller, otherwise fall back to
github.token. This allows users to pass a custom GitHub App token for
branded review comments.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: matej

action.yml

@@ -216,7 +216,7 @@ runs:
       if: steps.claudecode-check.outputs.enable_claudecode == 'true'
       shell: bash
       env:
-        GITHUB_TOKEN: ${{ github.token }}
+        GITHUB_TOKEN: ${{ env.GITHUB_TOKEN || github.token }}
         GITHUB_REPOSITORY: ${{ github.repository }}
         PR_NUMBER: ${{ github.event.pull_request.number }}
         ANTHROPIC_API_KEY: ${{ inputs.claude-api-key }}
@@ -360,7 +360,7 @@ runs:
       if: github.event_name == 'pull_request' && inputs.comment-pr == 'true' && steps.claudecode-check.outputs.enable_claudecode == 'true'
       shell: bash
       env:
-        GITHUB_TOKEN: ${{ github.token }}
+        GITHUB_TOKEN: ${{ env.GITHUB_TOKEN || github.token }}
         CLAUDECODE_FINDINGS: ${{ steps.claudecode-scan.outputs.findings_count }}
         SILENCE_CLAUDECODE_COMMENTS: ${{ steps.claudecode-check.outputs.silence_claudecode_comments }}
         DISMISS_STALE_REVIEWS: ${{ inputs.dismiss-stale-reviews }}