fix: make log dir overrideable in tests (#909) (thanks @roshanasingh4)

apps/macos/Tests/ClawdbotIPCTests/LogLocatorTests.swift

@@ -1,21 +1,24 @@
+import Darwin
 import Foundation
 import Testing
 @testable import Clawdbot
 
 @Suite struct LogLocatorTests {
     @Test func launchdGatewayLogPathEnsuresTmpDirExists() throws {
-        let dirPath = "/tmp/clawdbot"
         let fm = FileManager.default
+        let baseDir = URL(fileURLWithPath: NSTemporaryDirectory(), isDirectory: true)
+        let logDir = baseDir.appendingPathComponent("clawdbot-tests-\(UUID().uuidString)")
 
-        // Simulate a clean machine state where /tmp/clawdbot does not exist.
-        if fm.fileExists(atPath: dirPath) {
-            try? fm.removeItem(atPath: dirPath)
+        setenv("CLAWDBOT_LOG_DIR", logDir.path, 1)
+        defer {
+            unsetenv("CLAWDBOT_LOG_DIR")
+            try? fm.removeItem(at: logDir)
         }
 
         _ = LogLocator.launchdGatewayLogPath
 
         var isDir: ObjCBool = false
-        #expect(fm.fileExists(atPath: dirPath, isDirectory: &isDir))
+        #expect(fm.fileExists(atPath: logDir.path, isDirectory: &isDir))
         #expect(isDir.boolValue == true)
     }
 }