Remove .npmrc from repo to fix CI registry errors

The checked-in .npmrc pointed all registry lookups at localhost:4873
(Verdaccio), causing pnpm/action-setup to fail in CI with
ECONNREFUSED. Since Verdaccio is only needed locally, .npmrc is now
gitignored and kept as a local-only file.

Author: sandboxws

.gitignore

@@ -389,6 +389,9 @@ openspec/
 dashboard/.env.production
 dashboard/.env.staging
 
+### Local registry config ###
+.npmrc
+
 ### Go ###
 bin/
 *.exe