chore(scripts): exclude core-eslint from coverage diff gate

core-eslint has no @vitest/coverage-v8 so it never generates lcov data.
Add it to the tooling-packages allowlist alongside core-testing so changes
to rule source files don't trip the no-coverage-data gate.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/coverage/diff.mjs

@@ -67,6 +67,7 @@ const ALLOWED_GLOBS = [
   /\/ui\//,
   // Tooling packages that don't generate a vitest lcov (no @vitest/coverage-v8)
   /^packages\/core-testing\//,
+  /^packages\/core-eslint\//,
   // Pure type-alias / interface files (no executable code)
   /\.d\.ts$/, // ambient declaration files — no runtime code by definition
   /\.interface\.ts$/,