fix(track): read a late arrival frame before timing it out, so a measured wrong angle is never retried away

- observeArrivalRotation reads the sample before the deadline check and keeps
  a late frame's angle on the timeout result; arrivalAngleViolated then makes
  it final. Regressions: wrong late reveal and wrong late settle, each followed
  by a clean second attempt, still fail; a clean late frame stays retryable.
- Overpass admission tests: a monotonic per-test clock removes order
  dependence on the module-level limiters; the proxy test covers ::1 and
  ::ffff:127.0.0.1 sockets; a new test pins the proxied: upstream bucket.
- Retry edges (wrong on-time reveal, maxAttempts, inclusive 10° limit) and a
  check that every name the track harness imports is exported.
- Docs: nginx needs Host, X-Forwarded-Proto and X-Forwarded-For; Docker bridge
  networking makes every host client one remote peer; list the exact
  forwarding headers; owner misses can also see 503.

scripts/format-scope.json

@@ -1073,6 +1073,7 @@
   "src/data/gbfsProxyRateLimit.test.mjs",
   "src/terrainHeightsBounds.test.mjs",
   "server/providers/overpass/requestAdmission.test.mjs",
+  "src/tooling/trackArrivalObservation.mjs",
   "src/tooling/trackArrivalObservation.test.mjs",
   "src/ui/styles/status-badge.css",
   "src/ui/statusBadge.test.mjs",