migrate from yarn 1 to pnpm

- switch root package manager to pnpm 10.33.4 via packageManager field
- add .npmrc with node-linker=hoisted for RN/Expo compatibility
- convert yarn resolutions to pnpm.overrides; pin psl@1.9.0 and @types/psl@1.1.1
  to keep types resolving under exports-aware resolution
- pin react-compiler-runtime and babel-plugin-react-compiler to real rc.3 (the
  deprecated "Wrong version name was published" tag would otherwise resolve)
- add pnpm.onlyBuiltDependencies allowlist for @sentry/cli, core-js-pure,
  esbuild, unrs-resolver
- regenerate pnpm-lock.yaml; delete yarn.lock; drop postinstall-postinstall
- update all workflows, Dockerfile, Dockerfile.embedr (root-level), Makefile,
  conductor.json; bskyembed/bskylink/bskyogcard/dev-env stay on yarn
- update docs (CLAUDE.md, docs/build.md, docs/testing.md, docs/localization.md,
  bskyweb/README.md, scripts/push-notification/README.md, BlueskyClip/README.md)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.github/workflows/pull-request-comment.yml

@@ -117,29 +117,31 @@ jobs:
         with:
           ref: ${{ steps.pr-info.outputs.head-sha }}
 
+      - uses: pnpm/action-setup@v4
+
       - name: 🔧 Setup Node
         uses: actions/setup-node@v6
         with:
           node-version-file: .nvmrc
-          cache: yarn
+          cache: pnpm
 
       - name: Install dependencies
-        run: yarn install --frozen-lockfile
+        run: pnpm install --frozen-lockfile
 
       - name: Lint check
-        run: yarn lint
+        run: pnpm lint
 
       - name: Lint lockfile
-        run: yarn lockfile-lint
+        run: pnpm lockfile-lint
 
       - name: 🔤 Compile translations
-        run: yarn intl:build 2>&1 | tee i18n.log
+        run: pnpm intl:build 2>&1 | tee i18n.log
 
       - name: Check for i18n compilation errors
         run: if grep -q "invalid syntax" "i18n.log"; then echo "\n\nFound compilation errors!\n\n" && exit 1; else echo "\n\nNo compilation errors!\n\n"; fi
 
       - name: Type check
-        run: yarn typecheck
+        run: pnpm typecheck
 
       - name: 🔨 Setup EAS
         uses: expo/expo-github-action@main
@@ -149,7 +151,7 @@ jobs:
           token: ${{ secrets.EXPO_TOKEN }}
 
       - name: ⛏️ Setup Expo
-        run: yarn global add eas-cli-local-build-plugin
+        run: pnpm add -g eas-cli-local-build-plugin
 
       - name: 🪛 Setup jq
         uses: dcarbone/install-jq-action@v2
@@ -175,10 +177,10 @@ jobs:
           SENTRY_AUTH_TOKEN=${{ secrets.SENTRY_AUTH_TOKEN }}
           SENTRY_RELEASE=${{ steps.env.outputs.EXPO_PUBLIC_RELEASE_VERSION }}
           SENTRY_DIST=${{ steps.env.outputs.EXPO_PUBLIC_BUNDLE_IDENTIFIER }}
-          yarn export
+          pnpm export
 
       - name: 📦 Package Bundle and 🚀 Deploy
-        run: yarn use-build-number bash scripts/bundleUpdate.sh
+        run: pnpm use-build-number bash scripts/bundleUpdate.sh
         env:
           DENIS_API_KEY: ${{ secrets.DENIS_API_KEY }}
           CHANNEL_NAME: pull-request-${{ github.event.issue.number }}