fix: disable patch coverage check on main/develop branches

Patch coverage should only run on PRs, not on direct pushes to
main or develop. This was causing false failures on release merges.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: SimplyLiz

codecov.yml

@@ -17,6 +17,7 @@ coverage:
       default:
         target: 30%
         threshold: 0%
+        only_pulls: true
 
 comment:
   # Codecov's recommended condensed format
@@ -42,3 +43,4 @@ flag_management:
         threshold: 1%
       - type: patch
         target: 30%
+        only_pulls: true