Remove fork-only Renovate pipeline merged upstream by mistake

PR #82 (turegjorup/feat/renovate-auto-patch) was a Phase 1 fork-validation
branch that should have stayed on the fork. It was merged into upstream
develop, bringing the Renovate auto-patch/auto-release pipeline and a
fork-specific change that commented out the Codecov upload step.

Remove the fork-only files (renovate.json, renovate + auto-release
workflows, renovate-changelog.sh) and restore the Codecov upload step in
pr.yaml.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: turegjorup

.github/scripts/renovate-changelog.sh

@@ -37,15 +37,13 @@ jobs:
                   docker compose exec -e XDEBUG_MODE=coverage phpfpm bin/console --env=test doctrine:migrations:migrate --no-interaction --quiet
                   docker compose exec -e XDEBUG_MODE=coverage phpfpm vendor/bin/phpunit --coverage-clover=coverage/unit.xml
 
-            # Codecov upload disabled on the fork — no CODECOV_TOKEN secret.
-            # Re-enable when promoting to upstream.
-            # - name: Upload coverage to Codecov
-            #   uses: codecov/codecov-action@v5
-            #   with:
-            #       token: ${{ secrets.CODECOV_TOKEN }}
-            #       files: ./coverage/unit.xml
-            #       fail_ci_if_error: true
-            #       flags: unittests
+            - name: Upload coverage to Codecov
+              uses: codecov/codecov-action@v5
+              with:
+                  token: ${{ secrets.CODECOV_TOKEN }}
+                  files: ./coverage/unit.xml
+                  fail_ci_if_error: true
+                  flags: unittests
 
     build-assets:
         runs-on: ubuntu-latest