Fetch CI submodules over HTTPS and run the race detector

Why: Checkout did not recurse, so go vet failed without deps/agent-intent, and the runner has no SSH key.
Evidence: Workflow uses recursive HTTPS checkout, setup-go 1.27, GOPROXY=https://goproxy.cn,direct, and PROJECT.md vet plus test plus race.
Impact: vet-and-test runs on ubuntu-latest. SUBMODULE_TOKEN must be set by the owner before checkout can succeed.
Refs: feature/agent-stack-r0-r1
Co-authored-by: Cursor <cursoragent@cursor.com>

.gitea/workflows/ci.yml

@@ -6,10 +6,20 @@ on:
     branches: [main]
 jobs:
   vet-and-test:
-    runs-on: nightly
+    runs-on: ubuntu-latest
+    env:
+      GOPROXY: https://goproxy.cn,direct
     steps:
+      - name: Configure submodule auth over HTTPS
+        run: git config --global url."https://weichen:${{ secrets.SUBMODULE_TOKEN }}@git-home.u1680832.nyat.app:30319/".insteadOf "ssh://git@git-ssh.u1680832.nyat.app:31411/"
       - uses: actions/checkout@v4
-      - run: go vet ./... && go test -count=1 ./...
+        with:
+          submodules: recursive
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.27"
+      - name: Vet, test, and race
+        run: go vet ./... && go test -count=1 ./... && go test -count=1 -race ./...
   docker-checkout-hostgateway:
     runs-on: ubuntu-latest
     options: --add-host gitea:host-gateway