sh1pt: install Node pnpm CI (node-pnpm-ci@1.1.0) (#6)

* Add .github/workflows/ci.yml via sh1pt node-pnpm-ci@1.1.0

* Convert CI workflow to Go (build + vet)

agentbbs is a Go project (go.mod, go 1.26); the Node/pnpm workflow could
never pass here — pnpm/action-setup found no packageManager. Replace with
go build + go vet. Companion test.yml runs go test.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: sh1pt-actions-fleet[bot] <287014002+sh1pt-actions-fleet[bot]@users.noreply.github.com>
Co-authored-by: Anthony Ettinger <anthony@profullstack.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -0,0 +1,32 @@
+# Go CI for agentbbs. agentbbs is a Go project (see go.mod), so this builds and
+# vets every package on pushes to main and on pull requests. The companion
+# test.yml runs `go test`.
+name: CI
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ci-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.26'
+          cache: true
+
+      - run: go build ./...
+
+      - run: go vet ./...