chore: remove PR quality workflow configuration

Deleted the `.github/workflows/pr-quality.yml` file, which contained the configuration for the PR Quality workflow. This removal streamlines the repository by eliminating unused workflow files.

.github/workflows/pr-quality.yml

@@ -1,21 +0,0 @@
-
-name: PR Quality
-
-permissions:
-  contents: read
-  issues: read
-  pull-requests: write
-
-on:
-  pull_request_target:
-    types: [opened, reopened]
-
-jobs:
-  anti-slop:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: peakoss/anti-slop@v0
-        with:
-          blocked-commit-authors: "claude,copilot"
-          require-description: true
-          min-account-age: 5