[packages.dart] chore: migrate workspace to hermetic Bazel build environment

.github/workflows/update-readme.yml

@@ -1,41 +0,0 @@
-name: Update README
-
-on:
-  push:
-    branches:
-      - main
-    paths:
-      - 'packages/**'
-      - '.gitmodules'
-      - 'scripts/update_readme.dart'
-  workflow_dispatch:
-
-permissions:
-  contents: write
-
-jobs:
-  update-readme:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v6
-        with:
-          submodules: true
-
-      - name: Setup Dart
-        uses: dart-lang/setup-dart@v1
-
-      - name: Run update script
-        run: dart scripts/update_readme.dart
-
-      - name: Commit and Push
-        run: |
-          if [ -n "$(git status --porcelain README.md)" ]; then
-            git config --global user.name "github-actions[bot]"
-            git config --global user.email "github-actions[bot]@users.noreply.github.com"
-            git add README.md
-            git commit -m "docs: update README [skip ci]"
-            git push
-          else
-            echo "No changes to README.md"
-          fi

.github/workflows/update-submodules.yml

@@ -1,45 +0,0 @@
-name: Update Submodules
-
-on:
-  schedule:
-    - cron: '0 0 * * *' # Runs daily at midnight
-  workflow_dispatch:
-
-permissions:
-  contents: write
-  pull-requests: write
-
-jobs:
-  update-submodules:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v6
-        with:
-          submodules: true
-          fetch-depth: 0
-
-      - name: Update submodules
-        run: |
-          git submodule update --remote --recursive
-
-      - name: Check for changes
-        id: diff
-        run: |
-          if [ -n "$(git status --porcelain)" ]; then
-            echo "changes=true" >> $GITHUB_OUTPUT
-          else
-            echo "changes=false" >> $GITHUB_OUTPUT
-          fi
-
-      - name: Create Pull Request
-        if: steps.diff.outputs.changes == 'true'
-        uses: peter-evans/create-pull-request@v8
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          commit-message: "chore: update submodules"
-          title: "chore: update submodules"
-          body: "Automated update of submodules to their latest commits."
-          branch: update-submodules
-          base: main
-          delete-branch: true