Add container smoke acceptance

docs/CONTAINER.md

@@ -48,6 +48,35 @@ podman run --rm \
 
 The run output remains on the host under `runs/sample-noop`.
 
+## Smoke Check
+
+Run the reproducible smoke check from the repository root:
+
+```sh
+scripts/container_smoke.sh
+```
+
+The script:
+
+- detects `podman` or `docker`,
+- builds `guide-board-core:smoke`,
+- mounts a host output directory at `/runs`,
+- runs the bundled sample assessment,
+- verifies that the expected run artifacts are present on the host.
+
+Override the runtime, image name, or output directory when needed:
+
+```sh
+CONTAINER_RUNTIME=docker \
+GUIDE_BOARD_SMOKE_IMAGE=guide-board-core:local \
+GUIDE_BOARD_SMOKE_RUNS_DIR=/tmp/guide-board-container-smoke \
+scripts/container_smoke.sh
+```
+
+The smoke check uses only bundled sample profiles and the dependency-light core
+image. Restricted harness material and extension-specific runtime dependencies
+must stay in extension-specific images or explicit mounts.
+
 ## External Profiles
 
 Mount project-specific profiles read-only: