SoCal, the whole bay, a moon, and gates that actually run

Six agents in parallel, and the two city packs independently reported the same
blocker: `focusRegions` and `coarseFactor` existed on the `City` type and
nothing implemented them. Uniform lattices would have been 2.9M points for
Southern California and 3.7M for the expanded bay. Both packs were unloadable
as written.

`buildAxis` is the answer, and it is honest about its limits: refinement is per
axis, not per rectangle, so a focus region sharpens its whole row *and* its
whole column. Two regions at opposite corners refine nearly everything between
them. Measured, not guessed — the bay went 0.53M points with one region and
1.64M with three, for detail nobody is looking at from a board this wide. One
region each, coarse factor ten, and the builds land at 3.8 s and 2.3 s.

Then three things that were only ever right because San Francisco was the only
city. `maxDistance: 340` and a 170-unit shadow box were constants tuned for a
230-unit board; the bay is 1003 units across and the camera physically could
not retreat far enough to frame it. Fog distances were scene units pinned to
the same assumption. And `minVisibilityM` defaulted to 4.5 km of honest
weather, which over ninety-four kilometres of bay correctly hides three
quarters of it — the night view was a black rectangle for a completely
reasonable reason. All three now derive from the board.

The moon is a real ephemeris and its light is a deliberate lie: 1.15, against a
physical ratio of one to four hundred thousand. What is being reproduced is
what a moonlit night looks like on a screen in a lit room.

The CI gate caught itself, which is the part worth keeping. Port 8431 was
already held by a server from an earlier session, so the boot check polled a
healthy stranger while the process it started died on EADDRINUSE. It now
refuses to run rather than pass.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

server/src/app.ts

@@ -19,6 +19,7 @@ import { registerFlights } from "./routes/flights.ts";
 import { registerHealth } from "./routes/health.ts";
 import { registerMarkers } from "./routes/markers.ts";
 import { registerOffices } from "./routes/offices.ts";
+import { registerSession } from "./routes/session.ts";
 import { registerWeather } from "./routes/weather.ts";
 import { createServices } from "./services.ts";
 import type { ErrorBody } from "../../src/server/wire.ts";
@@ -46,6 +47,7 @@ export function buildApp(config: Config = loadConfig()): FastifyInstance {
   registerWeather(app, services);
   registerMarkers(app, services);
   registerOffices(app, services);
+  registerSession(app, services);
 
   app.setNotFoundHandler(async (_req, reply) => {
     const body: ErrorBody = { error: "not_found", message: "No such route." };