Fix coverage extraction for SimpleCov's current output format (#124)

* Initial plan

* Fix coverage extraction to work with SimpleCov's new format

Co-authored-by: kwerle <23320+kwerle@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: kwerle <23320+kwerle@users.noreply.github.com>

Author: Copilot

.github/workflows/test.yml

@@ -33,7 +33,8 @@ jobs:
         fi
         
         # Use sed for better portability - account for optional spaces after colon
-        COVERAGE=$(sed -n 's/.*"coverage": *\([0-9.]*\).*/\1/p' coverage/.last_run.json | head -1)
+        # SimpleCov format: { "result": { "line": 87.63 } }
+        COVERAGE=$(sed -n 's/.*"line": *\([0-9.]*\).*/\1/p' coverage/.last_run.json | head -1)
         if [ -z "$COVERAGE" ]; then
           echo "Error: Could not extract coverage percentage"
           echo "Contents of coverage/.last_run.json:"