Add weather API bundle adapter

internal/adapters/weatherapi/testdata/alerts.json

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+{
+  "data": {
+    "asOf": "2026-05-29T14:00:00Z",
+    "alerts": []
+  }
+}

internal/adapters/weatherapi/testdata/current.json

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+{
+  "data": {
+    "conditionText": "Partly cloudy",
+    "isDay": true,
+    "temperatureF": 75.9,
+    "apparentTemperatureF": 76.1,
+    "windSpeedMph": 10.7,
+    "relativeHumidityPercent": 56
+  }
+}

internal/adapters/weatherapi/testdata/discussion.json

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+{
+  "data": {
+    "officeId": "LSX",
+    "officeName": "St. Louis",
+    "product": "discussion",
+    "issuedAt": "2026-05-29T09:25:00-05:00",
+    "keyMessages": [
+      "Scattered showers possible this evening.",
+      "Warmer temperatures this weekend."
+    ],
+    "shortTerm": {
+      "title": "Short Term",
+      "narrative": "A weak boundary may trigger isolated showers."
+    }
+  }
+}

internal/adapters/weatherapi/testdata/hourly.json

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+{
+  "data": {
+    "locationId": "nws-lsx-grid-90-74",
+    "locationName": "St. Louis, MO",
+    "issuedAt": "2026-05-29T10:30:00-05:00",
+    "updatedAt": "2026-05-29T10:45:00-05:00",
+    "product": "hourly",
+    "latitude": 38.63,
+    "longitude": -90.2,
+    "elevationFeet": 466,
+    "periods": [
+      {
+        "startTime": "2026-05-29T13:00:00-05:00",
+        "endTime": "2026-05-29T14:00:00-05:00",
+        "isDay": true,
+        "conditionCode": 3,
+        "textDescription": "Partly sunny",
+        "temperatureF": 81,
+        "windSpeedMph": 12,
+        "windGustMph": 20,
+        "probabilityOfPrecipitationPercent": 10
+      }
+    ]
+  }
+}

internal/adapters/weatherapi/testdata/narrative.json

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+{
+  "data": {
+    "locationId": "nws-lsx-grid-90-74",
+    "locationName": "St. Louis, MO",
+    "issuedAt": "2026-05-29T10:30:00-05:00",
+    "product": "narrative",
+    "periods": [
+      {
+        "startTime": "2026-05-29T13:00:00-05:00",
+        "endTime": "2026-05-29T19:00:00-05:00",
+        "name": "Today",
+        "isDay": true,
+        "textDescription": "Partly sunny, with a high near 81.",
+        "temperatureF": 81,
+        "windSpeedMph": 12,
+        "probabilityOfPrecipitationPercent": 10
+      }
+    ]
+  }
+}

internal/adapters/weatherapi/testdata/observations.json

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+{
+  "data": {
+    "stationId": "KSTL",
+    "stationName": "St. Louis",
+    "timestamp": "2026-05-29T14:00:00Z",
+    "conditionCode": 3,
+    "isDay": true,
+    "textDescription": "Partly cloudy",
+    "temperatureF": 75.9,
+    "windSpeedMph": 10.7,
+    "relativeHumidityPercent": 56
+  }
+}