lib/maptool/kiwix.rb: a small reachability check for an external kiwix-serve instance. GET /api/kiwix reports it (same optional- integration pattern as offline-tiles/terrain-tiles); the frontend adds a "Nearby on Wikipedia" link to a point's popup pointing straight at kiwix-serve's own geo search (GET /search?latitude=&longitude= &distance=, confirmed from libkiwix's actual source rather than guessed) — linked to directly, not proxied/embedded, since it already has a full search UI of its own. docker-compose.yaml: new `kiwix` service (ghcr.io/kiwix/kiwix-serve) on the default network, KIWIX_URL wired to reach it by service name. The ZIM itself isn't part of the repo (large, self-contained archive) — data/kiwix/ gitignored same as the *.pmtiles files, setup steps in docs/development.adoc. No kiwix-serve/ZIM available here to test end-to-end — verified the app side against a stand-in local HTTP server (GET /api/kiwix flips available correctly) and confirmed the generated popup link matches the real geo-search query shape. docker-compose.yaml validated with `docker-compose config`. Full test suite: 118 runs, 0 failures.