Add Yahoo Finance stock data integration

- Add StockDataSource to fetch quotes from Yahoo Finance API
- Add StockSettingsStore for persisting user's stock symbols
- Add StockSettingsView with UI to manage symbols (max 5)
- Add STOCK feed item type and ranker weight (0.3)
- Integrate stock fetch into ContextOrchestrator pipeline
- Stock cards appear in FYI bucket and sync to Glass via BLE

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

IrisCompanion/iris/Models/HeuristicRanker.swift

@@ -90,6 +90,7 @@ final class HeuristicRanker {
         case .transit: return 0.75
         case .poiNearby: return 0.6
         case .info: return 0.4
+        case .stock: return 0.3
         case .nowPlaying: return 0.25
         case .currentWeather: return 0.0
         case .allQuiet: return 0.0

IrisCompanion/iris/Models/StockSettingsStore.swift

@@ -0,0 +1,48 @@
+//
+//  StockSettingsStore.swift
+//  iris
+//
+
+import Foundation
+import Combine
+
+@MainActor
+final class StockSettingsStore: ObservableObject {
+    nonisolated static let userDefaultsKey = "iris.stock.symbols"
+
+    @Published private(set) var symbols: [String] = []
+
+    private let maxSymbols = 5
+
+    init() {
+        loadSymbols()
+    }
+
+    private func loadSymbols() {
+        symbols = UserDefaults.standard.stringArray(forKey: Self.userDefaultsKey) ?? []
+    }
+
+    func saveSymbols(_ newSymbols: [String]) {
+        let cleaned = newSymbols
+            .map { $0.uppercased().trimmingCharacters(in: .whitespacesAndNewlines) }
+            .filter { !$0.isEmpty }
+            .prefix(maxSymbols)
+        symbols = Array(cleaned)
+        UserDefaults.standard.set(symbols, forKey: Self.userDefaultsKey)
+    }
+
+    @discardableResult
+    func addSymbol(_ symbol: String) -> Bool {
+        guard symbols.count < maxSymbols else { return false }
+        let cleaned = symbol.uppercased().trimmingCharacters(in: .whitespacesAndNewlines)
+        guard !cleaned.isEmpty, !symbols.contains(cleaned) else { return false }
+        symbols.append(cleaned)
+        UserDefaults.standard.set(symbols, forKey: Self.userDefaultsKey)
+        return true
+    }
+
+    func removeSymbol(_ symbol: String) {
+        symbols.removeAll { $0 == symbol.uppercased() }
+        UserDefaults.standard.set(symbols, forKey: Self.userDefaultsKey)
+    }
+}

IrisCompanion/iris/Models/Winner.swift

@@ -16,5 +16,6 @@ enum FeedItemType: String, Codable, CaseIterable {
     case nowPlaying = "NOW_PLAYING"
     case currentWeather = "CURRENT_WEATHER"
     case calendarEvent = "CALENDAR_EVENT"
+    case stock = "STOCK"
     case allQuiet = "ALL_QUIET"
 }