Make codecov coverage checks informational

Codecov's default behavior is to fail CI on any decrease from the
base commit's coverage. Small refactors can move the denominator
enough to trip this (recently a 0.12% drop) without the change
meaningfully reducing test quality.

Mark project and patch status as informational so coverage is
reported on PRs but never gates merge. Matches corosio's
configuration.

Author: sgerbino

.codecov.yml

@@ -12,6 +12,16 @@ codecov:
     after_n_builds: 1
     wait_for_ci: yes
 
+# Make coverage checks informational (report but never fail CI)
+coverage:
+  status:
+    project:
+      default:
+        informational: true
+    patch:
+      default:
+        informational: true
+
 # Change how pull request comments look
 comment:
   layout: "reach,diff,flags,files,footer"