fix(ci): prevent dev-build from running on PRs and fix YAML syntax

[d0ugal]

Changes

• Fixed YAML syntax errors (indentation issues with ref/sha in checkout steps)
• Added explicit PR exclusion to dev-build job: github.event_name == 'push'
• Fixed bracket spacing in branches array
• Standardized Codecov parameter to use files:

Issues Fixed

• CI was running dev-build on PRs (should only run on push to main)
• YAML syntax errors that could prevent workflows from running correctly

Testing

• YAML linting passes
• Workflow syntax validated