Refactor data sources and feed model

IrisCompanion/iris/Models/Candidate.swift

@@ -2,60 +2,7 @@
 //  Candidate.swift
 //  iris
 //
-//  Created by Codex.
+//  Deprecated: data sources now return typed data and the orchestrator produces `FeedItem`s.
 //
 
 import Foundation
-import WeatherKit
-
-struct Candidate: Codable, Equatable {
-    let id: String
-    let type: WinnerType
-    let title: String
-    let subtitle: String
-    let confidence: Double
-    let createdAt: Int
-    let ttlSec: Int
-    let condition: WeatherKit.WeatherCondition?
-    let metadata: [String: String]?
-
-    enum CodingKeys: String, CodingKey {
-        case id
-        case type
-        case title
-        case subtitle
-        case confidence
-        case createdAt
-        case ttlSec
-        case condition
-        case metadata
-    }
-
-    init(id: String,
-         type: WinnerType,
-         title: String,
-         subtitle: String,
-         confidence: Double,
-         createdAt: Int,
-         ttlSec: Int,
-         condition: WeatherKit.WeatherCondition? = nil,
-         metadata: [String: String]? = nil) {
-        self.id = id
-        self.type = type
-        self.title = title
-        self.subtitle = subtitle
-        self.confidence = confidence
-        self.createdAt = createdAt
-        self.ttlSec = ttlSec
-        self.condition = condition
-        self.metadata = metadata
-    }
-
-    func isExpired(at now: Int) -> Bool {
-        if ttlSec > 0 {
-            createdAt + ttlSec <= now
-        } else {
-            true
-        }
-    }
-}