Shared leaderboard, a games hub, AGPL, and two new street conditions

The high score table moves out of the browser and into a service, so
every player is on one board. It is a Node process with SQLite, no build
step and no native modules - node:sqlite ships with the runtime and Node
runs the TypeScript directly.

Everything in a request is treated as hostile: names forced to a
printable subset, every number range-checked, and scores refused if they
could not have happened in the days claimed. Bodies capped, submissions
rate limited per address. It still cannot prove a score is real, and
server/README.md says so plainly rather than implying otherwise.

The game degrades properly without it: the board says it cannot reach
town, posting happens behind the closing standings, and play is
untouched.

Deployment is three containers behind the host's nginx - the hub at /,
the game at /lemonade/, the scores service at /api/ - so the game keeps
its own container and a second game is just another service.

Licensing: AGPL-3.0-or-later, Affero because the leaderboard is a network
service. NOTICE.md credits Bob Jamison and Charlie Kellner, records that
this is clean-room work, and is honest about the one thing it is not:
some on-screen wording is quoted from the original and cannot be
licensed by us.

The street can now get better as well as worse. The summer fair brings
the town out and lifts what they will pay; a rival on the next corner
takes a share and lingers. Both show in the art and in the crowd. Over
500 seasons a player who reads the briefing survives every time and
finishes around $25.80; one who ignores it goes broke 70% of the time.

scripts/dev-all.mjs

@@ -0,0 +1,17 @@
+// Runs the game and the scores service together, so `npm run dev:all` is all
+// you need for a working leaderboard on localhost.
+import { spawn } from 'node:child_process'
+
+const children = [
+  spawn('npm', ['run', 'scores'], { stdio: 'inherit', shell: false }),
+  spawn('npm', ['run', 'dev'], { stdio: 'inherit', shell: false }),
+]
+
+const stop = () => {
+  for (const c of children) c.kill('SIGTERM')
+  process.exit(0)
+}
+
+process.on('SIGINT', stop)
+process.on('SIGTERM', stop)
+for (const c of children) c.on('exit', stop)