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.

package-lock.json

@@ -10,6 +10,7 @@
       "license": "MIT",
       "dependencies": {
         "@mapbox/vector-tile": "^3.0.0",
+        "@meri-imperiumi/eccodes-wasm": "^2.48.2",
         "cesium": "^1.124.0",
         "egm96-universal": "^1.1.1",
         "mgrs": "^2.1.0",
@@ -1076,6 +1077,24 @@
         "pbf": "^5.0.0"
       }
     },
+    "node_modules/@meri-imperiumi/eccodes-wasm": {
+      "version": "2.48.2",
+      "resolved": "https://registry.npmjs.org/@meri-imperiumi/eccodes-wasm/-/eccodes-wasm-2.48.2.tgz",
+      "integrity": "sha512-Z7rD3xInomPG7FS97ORD1UGKAdgeeRP9ofa9k4m8d+k2sDfDQeAjTzvs9UOndyaZovaSbEQeIoNX8gTmQNhiSA==",
+      "cpu": [
+        "x64",
+        "arm64"
+      ],
+      "license": "Apache-2.0",
+      "os": [
+        "darwin",
+        "linux",
+        "win32"
+      ],
+      "engines": {
+        "node": ">=24.0.0"
+      }
+    },
     "node_modules/@puppeteer/browsers": {
       "version": "3.2.2",
       "resolved": "https://registry.npmjs.org/@puppeteer/browsers/-/browsers-3.2.2.tgz",