ci: integrate codecov coverage reporting

codecov.yml

@@ -0,0 +1,34 @@
+codecov:
+  require_ci_to_pass: true
+  strict_yaml_branch: main
+
+coverage:
+  precision: 2
+  round: down
+  range: 0..100
+  status:
+    project:
+      default:
+        target: 70%
+        threshold: 1%
+    patch:
+      default:
+        target: auto
+        threshold: 5%
+        informational: true
+
+ignore:
+  - "test/**"
+  - "coverage/**"
+  - "docs/**"
+  - "adapters/**"
+  - "scripts/**"
+  - ".github/**"
+  - "*.config.js"
+  - "*.config.mjs"
+
+comment:
+  layout: "condensed_header, condensed_files, condensed_footer"
+  behavior: default
+  require_changes: false
+  hide_project_coverage: false