Add TFI workspace rename and directory handoff

Frameworks/TermindDomain/Shell/RemoteShellCommand.swift

@@ -0,0 +1,14 @@
+import Foundation
+
+/// Shell commands generated from remote session context rather than typed by the user.
+public nonisolated enum RemoteShellCommand {
+    /// Builds a one-shot directory change for a newly opened shell.
+    ///
+    /// Single-quoting keeps spaces and shell punctuation inert; embedded
+    /// apostrophes are closed, emitted literally, and reopened.
+    public static func changeDirectory(to path: String) -> String? {
+        guard !path.isEmpty else { return nil }
+        let quoted = path.replacingOccurrences(of: "'", with: "'\"'\"'")
+        return "cd '\(quoted)'"
+    }
+}