Improve coverage generation and fix CI workflow

README.md

@@ -234,15 +234,16 @@ ninja -C builddir test
 
 **Coverage reports:**
 ```bash
-# Using build script
-./scripts/build.sh debug --coverage
-./scripts/generate_coverage.sh
+# 1. Build with coverage enabled and run tests
+./scripts/build.sh debug --coverage --test
+
+# 2. Generate coverage reports
+./scripts/generate_coverage.sh              # All formats (html, xml, text)
+./scripts/generate_coverage.sh --html       # HTML only
+./scripts/generate_coverage.sh --text       # Text only
+./scripts/generate_coverage.sh --xml        # XML only (for CI/CD)
+./scripts/generate_coverage.sh --html --xml # HTML and XML
 
-# Or manually
-meson setup builddir -Db_coverage=true
-ninja -C builddir
-ninja -C builddir test
-ninja -C builddir coverage-text
 ```
 
 ## License