feat(router-plugin): add native Bun bundler integration

.changeset/fruity-pears-see.md

@@ -0,0 +1,8 @@
+---
+'@tanstack/router-plugin': minor
+'@tanstack/router-generator': minor
+---
+
+Add a native Bun plugin with file-based route generation and automatic code splitting, including shared route modules. Reuse Router HMR and expose resolved generator watch dependencies for native development-server watches.
+
+Reload edited virtual route configurations and their TypeScript imports when regenerating the route tree.

.github/workflows/bun.yml

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+name: Bun Router
+
+on:
+  pull_request:
+    paths:
+      - 'packages/router-plugin/**'
+      - 'e2e/react-router/bun-basic-file-based/**'
+      - 'e2e/e2e-utils/**'
+      - 'packages/router-generator/**'
+      - 'packages/router-utils/**'
+      - 'packages/virtual-file-routes/**'
+      - 'packages/router-core/**'
+      - 'packages/react-router/**'
+      - 'package.json'
+      - 'pnpm-lock.yaml'
+      - 'pnpm-workspace.yaml'
+      - 'nx.json'
+      - 'tsconfig.json'
+      - 'scripts/nx/**'
+      - '.npmrc'
+      - '.nvmrc'
+      - '.github/workflows/bun.yml'
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.number || github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+env:
+  CI: '1'
+  NX_DAEMON: 'false'
+  NX_NO_CLOUD: 'true'
+
+jobs:
+  router:
+    name: Bun Router (${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+      - name: Setup pnpm
+        uses: pnpm/action-setup@739bfe42ca9233c5e6aca07c1a25a9d34aca49b0 # v6.0.7
+      - name: Setup Node
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+        with:
+          node-version-file: .nvmrc
+          package-manager-cache: false
+      - name: Install dependencies
+        run: >-
+          pnpm install --frozen-lockfile
+          --filter .
+          --filter "@tanstack/router-plugin..."
+          --filter "tanstack-router-e2e-react-bun-basic-file-based..."
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2
+        with:
+          bun-version: '1.4.3'
+      - name: Install Chromium (Linux)
+        if: runner.os == 'Linux'
+        run: pnpm exec playwright install --with-deps chromium --only-shell
+      - name: Install Chromium (Windows and macOS)
+        if: runner.os != 'Linux'
+        run: pnpm exec playwright install chromium --only-shell
+      - name: Test production builds and navigation
+        run: pnpm nx run tanstack-router-e2e-react-bun-basic-file-based:test:e2e:bun --outputStyle=stream --skipRemoteCache