Run git subprocess off the main thread with a timeout

runGit() previously called Process.waitUntilExit() synchronously on
the MainActor with no timeout. If a git network operation (push/pull/
fetch) was in flight when the Mac went to sleep, the dead connection
could hang indefinitely on wake with no OS-level timeout of its own,
freezing the entire app UI with nothing logged since the command never
actually finished. Now runs on a background queue with a 30s timeout
(120s for clone), matching the pattern already used by bash_execute.

oAI/Services/GitSyncService.swift

@@ -76,7 +76,7 @@ class GitSyncService {
         }
 
         log.info("Cloning repository from \(self.settings.syncRepoURL)")
-        _ = try await runGit(["clone", url, localPath])
+        _ = try await runGit(["clone", url, localPath], timeout: 120)
         syncStatus.isCloned = true
 
         // Import immediately so this machine's DB is never left empty after a clone —
@@ -1069,36 +1069,70 @@ class GitSyncService {
         return url // SSH or other protocol
     }
 
-    private func runGit(_ args: [String], cwd: String? = nil) async throws -> String {
-        let process = Process()
-        process.executableURL = URL(fileURLWithPath: "/usr/bin/git")
-        process.arguments = args
+    /// Runs off the main thread with a hard timeout, rather than blocking synchronously on
+    /// `waitUntilExit()` on the (MainActor-isolated, per this project's default actor isolation)
+    /// calling thread. A plain `git fetch`/`pull`/`push` over a connection that died silently
+    /// during system sleep can otherwise hang indefinitely with no OS-level timeout of its own —
+    /// since that used to block the main thread, it froze the entire app UI with nothing to show
+    /// for it in the logs (no error is ever produced by a command that never finishes). Every
+    /// MainActor-touching value (paths, the logger) is captured *before* dispatching to the
+    /// background queue — the queue's closure must not touch `self` or other MainActor state.
+    private func runGit(_ args: [String], cwd: String? = nil, timeout: TimeInterval = 30) async throws -> String {
+        let workingDirectoryURL = cwd.map { URL(fileURLWithPath: expandPath($0)) }
+        let log = self.log
 
-        if let cwd = cwd {
-            process.currentDirectoryURL = URL(fileURLWithPath: expandPath(cwd))
+        return try await withCheckedThrowingContinuation { continuation in
+            DispatchQueue.global(qos: .userInitiated).async {
+                let process = Process()
+                process.executableURL = URL(fileURLWithPath: "/usr/bin/git")
+                process.arguments = args
+                if let workingDirectoryURL {
+                    process.currentDirectoryURL = workingDirectoryURL
+                }
+
+                let outputPipe = Pipe()
+                let errorPipe = Pipe()
+                process.standardOutput = outputPipe
+                process.standardError = errorPipe
+
+                var timedOut = false
+                let timeoutItem = DispatchWorkItem {
+                    if process.isRunning {
+                        timedOut = true
+                        process.terminate()
+                    }
+                }
+                DispatchQueue.global().asyncAfter(deadline: .now() + timeout, execute: timeoutItem)
+
+                do {
+                    try process.run()
+                    process.waitUntilExit()
+                } catch {
+                    timeoutItem.cancel()
+                    continuation.resume(throwing: error)
+                    return
+                }
+                timeoutItem.cancel()
+
+                let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
+                let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
+
+                let output = String(data: outputData, encoding: .utf8) ?? ""
+                let error = String(data: errorData, encoding: .utf8) ?? ""
+
+                guard process.terminationStatus == 0 else {
+                    let message = timedOut
+                        ? "Timed out after \(Int(timeout))s — this can happen if your Mac just woke from sleep and the network hasn't reconnected yet. Try again in a moment."
+                        : (error.isEmpty ? "Unknown error" : error)
+                    log.error("Git command failed: \(args.joined(separator: " "))")
+                    log.error("Error: \(message)")
+                    continuation.resume(throwing: SyncError.gitFailed(message))
+                    return
+                }
+
+                continuation.resume(returning: output)
+            }
         }
-
-        let outputPipe = Pipe()
-        let errorPipe = Pipe()
-        process.standardOutput = outputPipe
-        process.standardError = errorPipe
-
-        try process.run()
-        process.waitUntilExit()
-
-        let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
-        let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
-
-        let output = String(data: outputData, encoding: .utf8) ?? ""
-        let error = String(data: errorData, encoding: .utf8) ?? ""
-
-        guard process.terminationStatus == 0 else {
-            log.error("Git command failed: \(args.joined(separator: " "))")
-            log.error("Error: \(error)")
-            throw SyncError.gitFailed(error.isEmpty ? "Unknown error" : error)
-        }
-
-        return output
     }
 
     private func expandPath(_ path: String) -> String {