Fix yalc add to use --link flag for pnpm lockfile compatibility

The pnpm-lock.yaml in spec/dummy uses link: protocol for the
react-on-rails dependency, but yalc add (without --link) changes
package.json to use file: protocol, causing ERR_PNPM_OUTDATED_LOCKFILE
errors in CI.

Adding --link flag ensures yalc maintains the link: protocol that
matches the lockfile, fixing all CI workflow failures.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: justin808

.github/workflows/integration-tests.yml

@@ -150,7 +150,8 @@ jobs:
       - name: yalc publish for react-on-rails
         run: cd packages/react-on-rails && yalc publish
       - name: yalc add react-on-rails
-        run: cd react_on_rails/spec/dummy && yalc add react-on-rails
+        # Use --link to maintain the link: protocol that matches pnpm-lock.yaml
+        run: cd react_on_rails/spec/dummy && yalc add --link react-on-rails
       - name: Install Node modules with pnpm for dummy app
         # --ignore-workspace prevents pnpm from treating this as part of the parent workspace
         # The dummy app doesn't have a pnpm-lock.yaml and shouldn't use frozen lockfile
@@ -256,7 +257,8 @@ jobs:
       - name: yalc publish for react-on-rails
         run: cd packages/react-on-rails && yalc publish
       - name: yalc add react-on-rails
-        run: cd react_on_rails/spec/dummy && yalc add react-on-rails
+        # Use --link to maintain the link: protocol that matches pnpm-lock.yaml
+        run: cd react_on_rails/spec/dummy && yalc add --link react-on-rails
       - name: Install Node modules with pnpm for dummy app
         # --ignore-workspace prevents pnpm from treating this as part of the parent workspace
         # The dummy app doesn't have a pnpm-lock.yaml and shouldn't use frozen lockfile

.github/workflows/lint-js-and-ruby.yml

@@ -132,7 +132,8 @@ jobs:
       - name: yalc publish for react-on-rails
         run: cd packages/react-on-rails && yalc publish
       - name: yalc add react-on-rails
-        run: cd react_on_rails/spec/dummy && yalc add react-on-rails
+        # Use --link to maintain the link: protocol that matches pnpm-lock.yaml
+        run: cd react_on_rails/spec/dummy && yalc add --link react-on-rails
       - name: Install Node modules with pnpm for dummy app
         # --ignore-workspace prevents pnpm from treating this as part of the parent workspace
         # The dummy app has its own dependencies and uses yalc links

.github/workflows/precompile-check.yml

@@ -113,7 +113,8 @@ jobs:
       - name: yalc publish for react-on-rails
         run: cd packages/react-on-rails && yalc publish
       - name: yalc add react-on-rails
-        run: cd react_on_rails/spec/dummy && yalc add react-on-rails
+        # Use --link to maintain the link: protocol that matches pnpm-lock.yaml
+        run: cd react_on_rails/spec/dummy && yalc add --link react-on-rails
       - name: Install Node modules with pnpm for dummy app
         run: cd react_on_rails/spec/dummy && pnpm install --ignore-workspace
       - name: Save dummy app ruby gems to cache