chore: drop exports nothing imports

Knip, configured with the application, package exports, scripts, QA
harnesses, workers, tools and tests as entry points, reports exports
that no module imports. Each was checked by hand against string-based
and namespace imports.

- Symbols that are still used inside their own module lose only the
  `export` keyword (176 constants and helpers).
- Unused re-exports are removed from barrel modules (flight, military,
  vessel, CCTV, directions, transit history, local ADS-B and street-level
  policy modules).
- Declarations that nothing uses at all are deleted, among them
  AIS_WATCHDOG_STATUSES, applyFilter, isRadioCountryCode, compactText,
  DENSITY_STOPS, the unused CCTV endpoint constants, and the SDR band
  constants.
- Default exports that nothing imports are removed. The ones in
  src/data/earthquakes.js, src/data/telegeographySubmarineCables.js,
  src/data/wind.js and src/data/bhoteKoshiLocator.js each constructed a
  layer instance at import time that nothing used; those instances are
  no longer created.

Every export of a package.json entry stays, as does TOMTOM_CREDIT,
which the traffic layer reads from the credits namespace it is given.

src/app/embed.js

@@ -15,9 +15,9 @@ import * as Cesium from 'cesium';
 import { announceNavigationAuthority } from '../navigationPolicy.js';
 import { annotationsFromParams, createView } from '../view/index.js';
 
-export const EMBED_VIEW_MESSAGE = 'gev:view';
-export const EMBED_APPLIED_MESSAGE = 'gev:view-applied';
-export const EMBED_READY_MESSAGE = 'gev:ready';
+const EMBED_VIEW_MESSAGE = 'gev:view';
+const EMBED_APPLIED_MESSAGE = 'gev:view-applied';
+const EMBED_READY_MESSAGE = 'gev:ready';
 
 const FOLLOW_LAYERS = {
   aircraft: 'flights',