Introduces a long-lived `pid` cookie (365 d) as persistent player identity
alongside the existing 24 h `sid` session cookie.

On first visit, a player row is upserted into `players`. On round end, a
transaction inserts into `games` and updates aggregates (best_attempts on wins
only, streak counters, last_played_at). DB failures are caught and logged —
the game keeps serving.

Adds a 3×2 'Your best' stats panel and a public top-10 scoreboard (fewest
best_attempts ASC, earliest last_played_at as tie-breaker; identifiers
truncated to 8 chars; current player highlighted).

Infrastructure: adds `pg` dependency, Dockerfile now installs npm deps before
copying server.mjs, docker-compose forwards all provisioned TXT_GAME_DB_*
vars and joins the postgres_postgres network for container-to-container reach.

Task: d1c49d59-57bd-4eba-9e22-f25a04157ad4

Wire in the txt_game_scores database provision and create the
players/games tables via a provision-scoped migration so Child 2
can implement the server-side score persistence.

- module.yml: requires postgres database (txt_game_scores) with
  env_map for host/port/user/password/name; empty env keys added
  so env-sync populates them after provisioning
- migrations/package.json: ESM, pg + typescript devdeps
- migrations/provision/postgres/000-init-scores.ts: creates
  players and games tables with idempotent IF NOT EXISTS guards
  and two supporting indexes (scoreboard sort, history lookup)

Server code, Dockerfile, and docker-compose.yml are unchanged —
server integration is deferred to the follow-on child task.

Task: 3dab55e3-9792-47a0-a4a6-ba7757517314

curl -sSI and Traefik probes use HEAD; the server only handled GET,
causing HEAD / to fall through to the 404 handler.

- Fix module.yml docker: section from object to list format so
  the builder actually builds and pushes the image
- Replace build: . with registry image reference in compose
- Fix certresolver name from letsencrypt to le
- Add explicit container_name, remove unused default network

Number guessing game (1-100, 7 attempts) as a HAL custom-app module.
Serves HTML form UI with per-session state via cookie, no npm deps.
Traefik labels for txt.${DOMAIN} on websecure with letsencrypt TLS.