revert(ci): un-shard egg-bin; keep single job (sharding broke fork isolation)

Splitting egg-bin by file made dev.test.ts / test.test.ts run in isolation,
which broke fork-based tests that depend on cross-file shared state under
isolate:false (e.g. dev --baseDir=root, test -h help) — green when the suite
runs whole, red when split. Same isolation class as the tegg controller fix,
but egg-bin has several such tests and fixing each would change test files.

Revert to the original single egg-bin job (kept the windows HOME export). The
job runs the whole egg-bin suite as before; it is not the binding wall
constraint given macos/windows whole-suite jobs dominate total wall.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: killagu

.github/workflows/ci.yml

@@ -263,16 +263,12 @@ jobs:
       matrix:
         os: ['ubuntu-latest', 'windows-latest']
         node: ['24']
-        # dev.test.ts (~49s local) and test.test.ts (~42s) each spawn many
-        # egg-bin CLI subprocesses; vitest --shard hashes both into one slice,
-        # so split by explicit file groups to keep each ubuntu shard ≤60s.
-        bin-shard: ['dev', 'test', 'rest']
 
-    name: Test bin (${{ matrix.os }}, ${{ matrix.node }}, ${{ matrix.bin-shard }})
+    name: Test bin (${{ matrix.os }}, ${{ matrix.node }})
     runs-on: ${{ matrix.os }}
 
     concurrency:
-      group: test-egg-bin-${{ github.workflow }}-#${{ github.event.pull_request.number || github.head_ref || github.ref }}-(${{ matrix.os }}, ${{ matrix.node }}, ${{ matrix.bin-shard }})
+      group: test-egg-bin-${{ github.workflow }}-#${{ github.event.pull_request.number || github.head_ref || github.ref }}-(${{ matrix.os }}, ${{ matrix.node }})
       cancel-in-progress: true
 
     steps:
@@ -295,11 +291,10 @@ jobs:
         shell: pwsh
         run: echo "HOME=$env:USERPROFILE" >> $env:GITHUB_ENV
 
-      - name: Build egg-bin
-        run: ut run build -- --workspace ./tools/egg-bin
-
-      - name: Run tests (bin shard ${{ matrix.bin-shard }})
-        run: node scripts/run-egg-bin-shard.js ${{ matrix.bin-shard }}
+      - name: Run tests
+        run: |
+          ut run build -- --workspace ./tools/egg-bin
+          ut run ci --workspace @eggjs/bin
 
       - name: Code Coverage
         # skip on windows, it will hangup on codecov https://github.com/codecov/codecov-action/issues/1787