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The Empty branch of the Create Stack flow wrote a compose.yaml whose first service bound the host's port 8080 by default. On any workstation already running something on 8080 (traefik, caddy, librespeed, another nginx, etc.) the very first deploy failed at the docker compose networking step with "Bind for 0.0.0.0:8080 failed: port is already allocated", which made the day-one experience feel broken right after F-2 (PR #1168) tightened the dialog itself. The boilerplate in FileSystemService.createStack now emits the ports block commented out plus a one-line hint above it. A fresh deploy binds no host port, so the container starts cleanly on any host; the user uncomments the two-line block when they're ready to expose the container. The deterministic shape (no probe-and-write, no random port, no preflight scan) avoids the TOCTOU race that a free-port probe would have left between template creation and the actual compose up. Adds backend/src/__tests__/file-system-service-create-stack.test.ts (8 cases): directory + file creation, structural YAML assertions via yaml.parse to lock in the no-live-ports invariant, raw-text regex to lock in the commented hint, and the already-exists rejection path. FileSystemService.createStack had no coverage before this change. Adds e2e/default-stack-template-no-fixed-port.spec.ts (1 case): drives the dialog through Create, reads the resulting compose via the in-browser apiFetch, and asserts the live + commented invariants end-to-end. docs/features/stack-management.mdx Empty bullet rewritten to describe the minimal skeleton and the commented ports block instead of calling it "blank". Resolves: F-3 in the v1.0 audit tracker.