Link Ground Zero weather lookup coordinates

Data/Tiles/ground_zero_tiles.json

@@ -16,6 +16,15 @@
         "center_latitude": 37.5925,
         "center_longitude": -122.4995
       },
+      "weather_lookup_metadata": {
+        "lookup_latitude": 37.5925,
+        "lookup_longitude": -122.4995,
+        "coordinate_source": "tile_center",
+        "primary_provider": "open-meteo",
+        "fallback_provider": "noaa-nws",
+        "fallback_provider_eligible": true,
+        "lookup_rule": "Use the Ground Zero tile center latitude/longitude for live MVP weather and temperature snapshots."
+      },
       "status": "source_data_found",
       "biome_primary": "coastal_california_scrub_woodland",
       "biome_secondary": [

Data/Tiles/tile_registry.schema.json

@@ -113,6 +113,9 @@
         "growing_season_metadata": {
           "$ref": "#/$defs/growing_season_metadata"
         },
+        "weather_lookup_metadata": {
+          "$ref": "#/$defs/weather_lookup_metadata"
+        },
         "notes": {
           "type": "string"
         }
@@ -241,6 +244,46 @@
         }
       }
     },
+    "weather_lookup_metadata": {
+      "type": "object",
+      "required": [
+        "lookup_latitude",
+        "lookup_longitude",
+        "coordinate_source",
+        "primary_provider",
+        "fallback_provider_eligible",
+        "lookup_rule"
+      ],
+      "additionalProperties": false,
+      "properties": {
+        "lookup_latitude": {
+          "type": "number",
+          "minimum": -90,
+          "maximum": 90
+        },
+        "lookup_longitude": {
+          "type": "number",
+          "minimum": -180,
+          "maximum": 180
+        },
+        "coordinate_source": {
+          "type": "string",
+          "enum": ["tile_center", "manual_override", "provider_grid_point"]
+        },
+        "primary_provider": {
+          "type": "string"
+        },
+        "fallback_provider": {
+          "type": "string"
+        },
+        "fallback_provider_eligible": {
+          "type": "boolean"
+        },
+        "lookup_rule": {
+          "type": "string"
+        }
+      }
+    },
     "source": {
       "type": "object",
       "required": ["source_kind", "source_name", "coverage_status"],

Data/Tiles/tile_registry.sql

@@ -64,6 +64,19 @@ CREATE TABLE IF NOT EXISTS terrain_tile_growing_season_metadata (
     FOREIGN KEY (tile_id) REFERENCES terrain_tiles(tile_id)
 );
 
+CREATE TABLE IF NOT EXISTS terrain_tile_weather_lookup_metadata (
+    tile_id TEXT PRIMARY KEY,
+    lookup_latitude REAL NOT NULL CHECK (lookup_latitude >= -90 AND lookup_latitude <= 90),
+    lookup_longitude REAL NOT NULL CHECK (lookup_longitude >= -180 AND lookup_longitude <= 180),
+    coordinate_source TEXT NOT NULL CHECK (coordinate_source IN ('tile_center', 'manual_override', 'provider_grid_point')),
+    primary_provider TEXT NOT NULL DEFAULT 'open-meteo',
+    fallback_provider TEXT NOT NULL DEFAULT '',
+    fallback_provider_eligible INTEGER NOT NULL DEFAULT 0 CHECK (fallback_provider_eligible IN (0, 1)),
+    lookup_rule TEXT NOT NULL DEFAULT '',
+    generated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (tile_id) REFERENCES terrain_tiles(tile_id)
+);
+
 CREATE TABLE IF NOT EXISTS terrain_tile_neighbors (
     tile_id TEXT NOT NULL,
     direction TEXT NOT NULL CHECK (direction IN ('n', 'ne', 'e', 'se', 's', 'sw', 'w', 'nw')),

Data/Tiles/tile_weather_manifest.json

@@ -1,6 +1,6 @@
 {
   "schema_version": 1,
-  "generated_at_utc": "2026-05-16T05:58:06Z",
+  "generated_at_utc": "2026-05-16T09:06:51Z",
   "source_registry": "Data/Tiles/ground_zero_tiles.json",
   "generation_rule": "Every source-backed/generated tile with center coordinates is emitted; unknown placeholders are skipped.",
   "tiles": [
@@ -8,8 +8,11 @@
       "tile_id": "gz_us_ca_pacifica_utm10n_e544_n4160",
       "center_latitude": 37.5925,
       "center_longitude": -122.4995,
+      "coordinate_source": "tile_center",
       "provider": "open-meteo",
-      "lookup_rule": "Use tile center latitude/longitude for live MVP weather and temperature snapshots."
+      "fallback_provider": "noaa-nws",
+      "fallback_provider_eligible": true,
+      "lookup_rule": "Use the Ground Zero tile center latitude/longitude for live MVP weather and temperature snapshots."
     }
   ]
 }