docs(ci): complete bun/turborepo/changesets migration docs and workflows

- Update all CI workflows (pre-commit, tech-debt) to use Bun
- Update build scripts (js_build.sh, cypress_build.sh, eslint.sh) for Bun
- Add sync-package-versions.js script for release version alignment
- Simplify package.json scripts (build:packages, publish:packages)
- Add gitTag: false to changesets config to avoid repo tag clutter
- Remove obsolete Lerna scripts (build.js, lernaVersion.sh)
- Update RELEASING/README.md with comprehensive npm publishing guide
- Update all developer documentation for Bun usage
- Update LLM instruction files (AGENTS.md, dev-standard.mdc)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/tech-debt.yml

@@ -29,19 +29,19 @@ jobs:
       - name: Checkout Repository
         uses: actions/checkout@v6
 
-      - name: Set up Node.js
-        uses: actions/setup-node@v6
+      - name: Install Bun
+        uses: oven-sh/setup-bun@v2
         with:
-          node-version-file: './superset-frontend/.nvmrc'
+          bun-version: latest
 
       - name: Install Dependencies
-        run: npm ci
+        run: bun install --frozen-lockfile
         working-directory: ./superset-frontend
 
       - name: Run Script
         env:
           SPREADSHEET_ID: "1oABNnzxJYzwUrHjr_c9wfYEq9dFL1ScVof9LlaAdxvo"
           SERVICE_ACCOUNT_KEY: ${{ secrets.GSHEET_KEY }}
-        run: npm run lint-stats
+        run: bun run lint-stats
         continue-on-error: true
         working-directory: ./superset-frontend