fix(ci): bad pyinfra type coverage report comments (#36482)

.github/workflows/pyrefly-type-coverage-comment.yml

@@ -63,8 +63,8 @@ jobs:
         id: render
         run: |
           comment_body="$(uv run --directory api python libs/pyrefly_type_coverage.py \
-            --base base_report.json \
-            < pr_report.json)"
+            --base "$GITHUB_WORKSPACE/base_report.json" \
+            < "$GITHUB_WORKSPACE/pr_report.json")"
 
           {
             echo "### Pyrefly Type Coverage"

.github/workflows/pyrefly-type-coverage.yml

@@ -65,6 +65,9 @@ jobs:
           # Save structured data for the fork-PR comment workflow
           cp /tmp/pyrefly_report_pr.json pr_report.json
           cp /tmp/pyrefly_report_base.json base_report.json
+          # Keep fork-PR comments correct while the trusted workflow_run job is
+          # still using the default-branch renderer, which resolves --base from api/.
+          cp /tmp/pyrefly_report_base.json api/base_report.json
 
       - name: Save PR number
         run: |
@@ -77,6 +80,7 @@ jobs:
           path: |
             pr_report.json
             base_report.json
+            api/base_report.json
             pr_number.txt
 
       - name: Comment PR with type coverage