router: working local OSRM backend + per-backend bench goldens
- fix encoded-polyline decoder (zigzag: (n>>1) ^ -(n&1)) — caught by
the OSRM integration tests (Boston clearance 5681km -> 38km)
- OSRM client: routes[] JSON shape, overview=full for geometry,
polyline+geojson support
- local OSRM 26.4.1 built from source (no sudo): deps.sh (bzip2, lua
5.2 with readline stub, oneTBB, boost 1.84 via b2 + hand-rolled
CMake config files, osmium-tool), setup-osrm.sh (merge PBFs ->
extract -> partition -> customize -> serve :5000); v26 flag fixes
- bench: tasks.osrm.json goldens; both backends 26/26 PASS and agree
on all 5 optimized orders (Ladd->Cascade etc.)
- README: profile deltas (Valhalla 332min vs OSRM 410min, same route
shape), per-backend goldens, verified self-host status
Greg Pomerantz
0c4a1f9f60