Collapse docker-compose.yml + docker-compose.prod.yml into one file with dev/prod
profiles sharing a YAML anchor: dev builds from source, prod pulls ghcr latest.
make up/prod select the profile; down passes both so it stops either. Drops the
separate prod file and the !reset hack.
Concise verbs: make up (dev build+run), make prod (pull published image),
make down (stop regardless of mode), make clean (down + drop local image).
Updates all docs and compose-file comment headers to match.
docker-compose.yml now builds from source (dev-forward: run your local changes);
docker-compose.prod.yml overrides it to pull ghcr latest (build reset via !reset).
Adds make compose-up / compose-up-prod / compose-down. Env, ports, and extra_hosts
stay defined once in the base file; the prod override only swaps build -> image.
make smoke-docker builds the image, stands up a stub upstream + the container
on a shared network, and asserts forward+prefix-strip, upstream-header cleared,
421 on missing header, and 403 + reject sentinel on allowlist miss. Self-
contained (no tailnet), idempotent, local-only (Docker) like cargo-check.
