fix: correct coverage module name in test.yml workflow

Change --cov=com to --cov=blockcopy to match the actual module name.
This fixes the "Module com was never imported" warning and enables
proper coverage reporting.

https://claude.ai/code/session_01UvZ5rZoXjC5RDuz9Q3QSV6

Author: claude

.github/workflows/test.yml

@@ -49,4 +49,4 @@ jobs:
         python -m pytest -v --tb=native tests \
           --doctest-modules \
           --junitxml=junit/test-results.xml \
-          --cov=com --cov-report=xml --cov-report=html
+          --cov=blockcopy --cov-report=xml --cov-report=html