initial commit: Proximity iOS app proposal, full Swift code scaffold, reference backend, testing docs, generated Xcode project

Proximity/Services/Network/GraphStore.swift

@@ -0,0 +1,44 @@
+import Foundation
+import SwiftData
+
+/// Local persistence for the encounter graph using SwiftData (SQLite-backed).
+///
+/// The graph lives **on-device** by default. The user is in control of what
+/// syncs to the server. Encounters are stored as anonymous silhouettes until
+/// mutual consent promotes them to revealed connections.
+@Model
+final class GraphStore {
+
+    var encounters: [Encounter] = []
+    var connections: [Connection] = []
+    var messages: [ChatMessage] = []
+
+    init() {}
+
+    // MARK: - Encounters
+
+    func addEncounter(_ encounter: Encounter) {
+        encounters.insert(encounter, at: 0)
+    }
+
+    func encounter(byToken token: String) -> Encounter? {
+        encounters.first { $0.remoteAnonToken == token }
+    }
+
+    func updateStatus(_ status: EncounterStatus, for token: String) {
+        guard let idx = encounters.firstIndex(where: { $0.remoteAnonToken == token }) else { return }
+        encounters[idx].status = status
+    }
+
+    // MARK: - Connections
+
+    func addConnection(_ connection: Connection) {
+        connections.insert(connection, at: 0)
+    }
+
+    // MARK: - Messages
+
+    func addMessage(_ message: ChatMessage) {
+        messages.append(message)
+    }
+}