fix: disable Codecov auto-search to prevent duplicate coverage uploads

Each upload was finding both coverage files due to auto-search,
causing flags to have merged coverage data instead of their
specific test type coverage.

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

Author: mpyw

.github/workflows/ci.yml

@@ -37,6 +37,7 @@ jobs:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: ./coverage-unit.txt
           flags: unit
+          disable_search: true
           verbose: true
 
       - name: Upload e2e test coverage to Codecov
@@ -45,6 +46,7 @@ jobs:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: ./coverage-e2e.txt
           flags: e2e
+          disable_search: true
           verbose: true
 
   lint: