fix(ruby): always regenerate runtime-test fixtures before rspec

The `test` script guarded regeneration with `test -d ./lib || generate.sh`, so
it only rebuilt the generated bindings when lib/ was absent. lib/ is gitignored
generated output; when it was present but stale — built by an older
pacmak/rosetta — the specs silently ran against months-old bindings and reported
phantom failures (17, in a suite that is actually green).

Drop the guard so `yarn test` regenerates unconditionally. generate.sh is only a
few seconds and already `rm -rf lib` first, so this is cheap and eliminates the
stale-fixture failure mode. A comment in generate.sh warns against reinstating
the guard.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: omarqureshi

packages/@jsii/ruby-runtime-test/generate.sh

@@ -1,6 +1,12 @@
 #!/usr/bin/env bash
 # Generate the Ruby bindings for the jsii-calc fixture assemblies into ./lib,
 # where spec/spec_helper.rb expects to find them.  Invoked by `yarn build`.
+#
+# `yarn test` runs this every time, unconditionally — do NOT reintroduce a
+# `test -d ./lib || ...` guard. lib/ is gitignored generated output; when it is
+# present but stale (built by an older pacmak/rosetta) such a guard silently
+# runs the specs against months-old bindings and reports phantom failures. This
+# script is only a few seconds, so always regenerating is the safe default.
 set -euo pipefail
 
 genRoot="./lib"

packages/@jsii/ruby-runtime-test/package.json

@@ -22,7 +22,7 @@
   },
   "scripts": {
     "build": "bash ./generate.sh",
-    "test": "bash -c '{ test -d ./lib || bash ./generate.sh; } && bundle install --quiet && bundle exec rspec --require ./spec/compliance_formatter.rb --format ComplianceFormatter --format progress'"
+    "test": "bash -c 'bash ./generate.sh && bundle install --quiet && bundle exec rspec --require ./spec/compliance_formatter.rb --format ComplianceFormatter --format progress'"
   },
   "devDependencies": {
     "@jsii/ruby-runtime": "^0.0.0",