feat(macos): onboard Claude OAuth + identity

apps/macos/Sources/Clawdis/AgentWorkspace.swift

@@ -4,6 +4,8 @@ import OSLog
 enum AgentWorkspace {
     private static let logger = Logger(subsystem: "com.steipete.clawdis", category: "workspace")
     static let agentsFilename = "AGENTS.md"
+    static let identityStartMarker = "<!-- clawdis:identity:start -->"
+    static let identityEndMarker = "<!-- clawdis:identity:end -->"
 
     static func displayPath(for url: URL) -> String {
         let home = FileManager.default.homeDirectoryForCurrentUser.path
@@ -36,6 +38,31 @@ enum AgentWorkspace {
         return agentsURL
     }
 
+    static func upsertIdentity(workspaceURL: URL, identity: AgentIdentity) throws {
+        let agentsURL = try self.bootstrap(workspaceURL: workspaceURL)
+        var content = (try? String(contentsOf: agentsURL, encoding: .utf8)) ?? ""
+        let block = self.identityBlock(identity: identity)
+
+        if let start = content.range(of: self.identityStartMarker),
+           let end = content.range(of: self.identityEndMarker),
+           start.lowerBound < end.upperBound
+        {
+            content.replaceSubrange(
+                start.lowerBound..<end.upperBound,
+                with: block.trimmingCharacters(in: .whitespacesAndNewlines))
+        } else if let insert = self.identityInsertRange(in: content) {
+            content.insert(contentsOf: "\n\n## Identity\n\(block)\n", at: insert.upperBound)
+        } else {
+            content = [content.trimmingCharacters(in: .whitespacesAndNewlines), "## Identity\n\(block)"]
+                .filter { !$0.isEmpty }
+                .joined(separator: "\n\n")
+                .appending("\n")
+        }
+
+        try content.write(to: agentsURL, atomically: true, encoding: .utf8)
+        self.logger.info("Updated identity in \(agentsURL.path, privacy: .public)")
+    }
+
     static func defaultTemplate() -> String {
         """
         # AGENTS.md — Clawdis Workspace
@@ -51,4 +78,26 @@ enum AgentWorkspace {
         - Add your preferred style, rules, and “memory” here.
         """
     }
+
+    private static func identityBlock(identity: AgentIdentity) -> String {
+        let name = identity.name.trimmingCharacters(in: .whitespacesAndNewlines)
+        let theme = identity.theme.trimmingCharacters(in: .whitespacesAndNewlines)
+        let emoji = identity.emoji.trimmingCharacters(in: .whitespacesAndNewlines)
+
+        return """
+        \(self.identityStartMarker)
+        - Name: \(name)
+        - Theme: \(theme)
+        - Emoji: \(emoji)
+        \(self.identityEndMarker)
+        """
+    }
+
+    private static func identityInsertRange(in content: String) -> Range<String.Index>? {
+        if let firstHeading = content.range(of: "\n") {
+            // Insert after the first line (usually "# AGENTS.md …")
+            return firstHeading
+        }
+        return nil
+    }
 }