Finish SAND-WP-0002: remote smoke, podman-compose, HTTP stub

- T10 smoke passed on CoulombCore (sand-boxer self-deploy, sandbox 4e542c51)
- Add e2e smoke compose, scripts/smoke-compose-e2e.sh, make smoke-remote
- Support SANDBOXER_COMPOSE_CMD for podman-compose hosts
- FastAPI v0 stub at sandboxer.api.app; migration gaps doc
- Mark workplan finished (all 10 tasks done)

docs/runbooks/profile-compose-e2e.md

@@ -12,16 +12,23 @@ Provision a compose-based e2e sandbox via `ext.compose-ssh` (e2e-framework linea
 **Remote host** (CoulombCore or sandboxer01)
 
 - SSH access (`SANDBOXER_HOST` or `--host`)
-- Docker + compose plugin
+- Compose runtime: `docker compose` **or** `podman-compose` (CoulombCore uses podman)
 - Sufficient disk for images
 
 ```bash
 export SANDBOXER_HOST=coulombcore          # or 92.205.130.254
+export SANDBOXER_COMPOSE_CMD=podman-compose  # CoulombCore; omit on docker hosts
 # Omit SANDBOXER_SSH_USER to use ~/.ssh/config (CoulombCore: tegwick + id_ops)
-# export SANDBOXER_SSH_USER=tegwick        # only if not in ssh config
-# export SANDBOXER_SSH_KEY=~/.ssh/id_ops   # only to override config
 ```
 
+### Automated smoke (SAND-WP-0002-T10)
+
+```bash
+./scripts/smoke-compose-e2e.sh
+```
+
+Uses sand-boxer `e2e/docker-compose.smoke.yml` (nginx:alpine) — create → ps → destroy → verify cleanup.
+
 ## Create
 
 Target repo must contain `e2e/e2e.yml` (for compose file path) or a