Complete production realtime verification after Travis materialization

## Problem
The SpacetimeDB module has been published and `registered_voter` is preserved, but final production demo verification is blocked until derived Travis turfs are materialized.

## Goal
Complete end-to-end verification against `spacecanvas-5rvak` after chunked materialization lands.

## Acceptance Criteria
- Non-mutating subscription probe passes.
- Realtime smoke test claims a turf and updates one household target.
- One-button simulator starts 10,000 simulated canvassers and produces live volunteer GPS + status updates.
- Dashboard shows live map movement, right rail household updates, and aggregate stats.
- Mobile route can claim turf, share GPS, and update a household from browser and Android APK.
- Verification commands and observed counts are recorded in the README.

Start by materializing the derived Travis turfs for spacecanvas-5rvak, then run the non-mutating subscription probe and realtime smoke test described in the acceptance criteria. Verify the simulator, dashboard, browser route, and Android APK behavior, and record the verification commands and observed counts in the README.

Written by the indexing model from the issue text.