Merge wind and ECMWF candidates into walkthrough train

docs/CURRENT-STATE.md

@@ -1,5 +1,7 @@
 # God's Eye View Current State
 
+Wind is an optional GFS 10 m forecast overlay. Source acquisition has deadline and body budgets, disconnect cancellation and one-minute failure backoff. The row distinguishes model issue time from forecast valid time. Animation starts only with a field, stops on disable/destruction, preserves trails between unchanged canvas dimensions and scales from 200 to 4,000 particles with viewport area. Application catalog construction owns each instance.
+
 Search framing and annotations request semantic map features from an explicit source. The Overpass adapter owns bounded queries, member/tag decoding and request deadlines; callers retain candidate ranking, outline caching, deferred retries and scene placement. Empty, transient and throttled outcomes remain distinct. Traffic sources return road records and installation sources return mapped records with freshness/saturation metadata, so their layers no longer decode upstream elements. ALPR already normalizes its records in the source. Default providers, footprints, road directions, exact-viewport retries and source attribution are unchanged.
 
 Nepal media preloads survive repeated camera-flight updates, but Stop, event disable and replacement remove abandoned frames and revoke pending Facebook sessions. Fallback evidence-card clicks respect the shared drawing-tool pointer lease.
@@ -2442,6 +2444,7 @@ its criteria cannot be silently ignored.
 | Dams ▰ | OpenInfraMap/OSM extract (bundled) | `src/data/localLayers.js` | — | static |
 | Submarine Cables ◠ | TeleGeography public map (bundled) | `src/data/telegeographySubmarineCables.js` | — | static |
 | FIRMS Active Fires ▲ | NASA FIRMS live (VIIRS ×3 NRT, trailing 24h) | `src/data/firmsHeatmap.js` | `/api/firms` (`FIRMS_MAP_KEY`) | 10 min (proxy TTL 30 min) |
+| Wind 🌬 | NOAA GFS 10 m wind (keyless, 0.25°→1° grid; animated particles) | `src/data/wind.js` | `/api/wind` | 1 h (forecast cycle) |
 
 Directions is a keyless front end to the routing the voice agent already
 uses. Its row chips are the whole interface: DRIVE / WALK / BIKE pick the
@@ -3825,3 +3828,7 @@ frame. hls.js is imported only when an HLS camera starts. Two live sessions may
 coexist with at most eight independent consumer leases each; no-access lease
 expiry is 15 seconds. Closing one consumer leaves other consumers running. Encrypted/fMP4/byte-range playlists fail
 closed. Performance and live agency reliability require recorded validation.
+
+## Wind forecast models
+
+Wind supports selectable GFS/IFS models with persisted model choice. Each fetch chooses the available cycle and forecast step nearest the current time; rows show both issue and valid UTC timestamps. Grid identities include model, cycle and forecast step. Per-model caches retain the last two issued grids for manifest/grid rollover, coalesce concurrent requests, retain last-good data on failures and retry no faster than once per minute. Model changes clear the old field immediately, cancel old acquisition and ignore superseded results.