feat(wind): add keyless NOAA GFS wind layer with animated particles

Add a Wind layer animating the global 10 m wind field from NOAA GFS.

The /api/wind proxy selects the latest available 0.25° cycle, reads its .idx
inventory, byte-range fetches only the UGRD/VGRD 10 m GRIB2 messages (~1 MB
each instead of the whole ~500 MB file), decodes them with ecCodes (WASM),
resamples to a compact grid (1° default), and serves a manifest plus a Float32
U/V payload cached per cycle for an hour (single-flight, last-good on failure).

The client renders nullschool-style particles in a canvas overlay: bilinear
field sampling with longitude wrap, per-frame advection, Cesium camera
projection, and globe-occlusion culling via EllipsoidalOccluder.

Validated end-to-end against the real 2026-09-14 06z cycle on Node 25
(180x91 grid at 2°, 131,040-byte payload, plausible mean |u|/|v|). The WASM
decoder requires Node >=24, which the repo already requires.

Registered as `wind` (token k) with attribution and docs. Verified: npm test
(3412 pass, 0 fail), npm run check:boundaries.

DATA_SOURCES.md

@@ -15,6 +15,7 @@ How to read this:
 
 | Source                                                                | Used for                                                                                                                            | License / terms                                                                                                                                                                                                                                                                                                                                       | Attribution                                                                                                                                 |
 | --------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------- |
+| **NOAA GFS (wind)** | Global 10 m wind field for the animated Wind layer | U.S. public domain (NOAA); keyless via NOAA Open Data on AWS | "NOAA Global Forecast System (GFS)" (courtesy; not an endorsement) |
 | **OpenStreetMap ALPR camera locations** (including DeFlock community mapping) | Optional mapped automatic license-plate-reader camera layer | [ODbL 1.0](https://opendatacommons.org/licenses/odbl/1-0/); commercial use permitted with applicable attribution and database share-alike obligations | [© OpenStreetMap contributors](https://www.openstreetmap.org/copyright); [DeFlock](https://deflock.org) community mapping |
 | **Google Map Tiles API** (Photorealistic 3D Tiles) + Places/Geocoding | The 3D globe, voice scene context, and on-demand nearby installation search                                                         | Google Maps Platform ToS (proprietary, your own key + billing)                                                                                                                                                                                                                                                                                        | "Google" / "Google Maps" logo — **shown in-app**, required                                                                                  |
 | **OpenSky Network**                                                   | Primary worldwide live-flight snapshot                                                                                              | Non-commercial research/education license                                                                                                                                                                                                                                                                                                             | Schäfer et al., _"Bringing Up OpenSky"_, IPSN 2014 + opensky-network.org                                                                    |
@@ -134,6 +135,20 @@ transaction quota. Requires a free `FIRMS_MAP_KEY`
 (https://firms.modaps.eosdis.nasa.gov/api/map_key/); the layer is empty without it.
 The former bundled 2026-05-25 snapshot was removed 2026-07-16.
 
+### NOAA GFS wind
+
+The optional **Wind** layer animates the global 10 m wind field from NOAA's
+Global Forecast System (GFS). The `/api/wind` server-side proxy selects the
+latest available 0.25° cycle, reads its `.idx` inventory, byte-range fetches only
+the `UGRD`/`VGRD` 10 m GRIB2 messages (≈1 MB each instead of the whole ~500 MB
+file), decodes them with ecCodes (WASM), resamples to a compact grid (1° by
+default), and serves a manifest plus a Float32 U/V payload. It is keyless, cached
+per cycle for an hour, and is a **forecast, not an observation**: the particles
+show model flow, not measured wind. Rendering is a 2D canvas particle overlay
+advected by the field and projected through the Cesium camera; globe-occluded
+particles are skipped. NOAA GFS data is U.S. public domain; the credit above is a
+courtesy and does not imply endorsement.
+
 ### Natural Earth physical regions (`natural_earth/`)
 
 Curated from the **Natural Earth 10m physical vectors** (https://www.naturalearthdata.com/ —