chore: add --all flag to coverage commands

Ensures coverage reports include all source files, not just those that are tested. This provides a more accurate picture of overall code coverage.

Author: eablack

package.json

@@ -386,8 +386,8 @@
     "lint": "eslint . --ext .ts --config .eslintrc.cjs",
     "lint:fix": "eslint . --ext .ts --config .eslintrc.cjs --fix --quiet",
     "lint:fix:all": "eslint . --ext .ts --config .eslintrc.cjs --fix",
-    "coverage": "c8 --reporter=lcov --reporter=text-summary npm run test",
-    "coverage:html": "c8 --reporter=html --reporter=text-summary npm run test",
+    "coverage": "c8 --all --reporter=lcov --reporter=text-summary npm run test",
+    "coverage:html": "c8 --all --reporter=html --reporter=text-summary npm run test",
     "create-shrinkwrap": "npm shrinkwrap",
     "prepublishOnly": "npm run create-shrinkwrap",
     "postpublish": "rm -f oclif.manifest.json",