#939: remove obsolete postinstall patch

[akmhatey-ai]

Fixes #939.

This removes the obsolete patch-package postinstall path left behind after the project switched from grunt-mocha-cli to grunt-mocha-test in #892. The stale script checked for node_modules/grunt-mocha-cli, which is no longer installed, and the only patch under patches/ also targeted that removed package. Since grunt-mocha-test runs Mocha through its library wrapper rather than the old spawned CLI path, there is no equivalent patch target to keep.

Changes:

• remove scripts/postinstall.js
• remove patches/grunt-mocha-cli+7.0.0.patch
• remove patch-package from dev dependencies
• remove the postinstall package script

Validation:

• npm ci succeeds and no longer prints Production environment detected, skipping patch-package.
• npx grunt --file=test/test_eoc.js -> 8 passing
• npx mocha test/**/*.js --timeout 1200000 --grep eoc -> 9 passing
• npx mocha test/test_eoc.js --timeout 1200000 -> 8 passing
• npx eslint .
• git diff --check
• gitleaks detect --source . --no-banner --redact --log-opts HEAD

Limitations:

• Full npx grunt was attempted locally, but this Windows environment does not have JAVA_HOME/javac configured, so Java-backed EO/Maven tests fail before exercising this package cleanup.

[akmhatey-ai]

Closing this as duplicate. After opening it I rechecked the current PR queue and confirmed that #949 and #956 already make the same cleanup: remove the obsolete postinstall script, remove the stale grunt-mocha-cli patch, drop patch-package, and update package-lock.json. This PR does not add distinct value.