refactor(macos): centralize process pipe draining

apps/macos/Sources/Clawdbot/GatewayEnvironment.swift

@@ -278,10 +278,7 @@ enum GatewayEnvironment {
         process.standardOutput = pipe
         process.standardError = pipe
         do {
-            try process.run()
+            let data = try process.runAndReadToEnd(from: pipe)
-            // Read pipe before waitUntilExit to avoid potential deadlock
-            let data = pipe.fileHandleForReading.readToEndSafely()
-            process.waitUntilExit()
             let elapsedMs = Int(Date().timeIntervalSince(start) * 1000)
             if elapsedMs > 500 {
                 self.logger.warning(

apps/macos/Sources/Clawdbot/LaunchAgentManager.swift

@@ -72,11 +72,11 @@ enum LaunchAgentManager {
             let process = Process()
             process.launchPath = "/bin/launchctl"
             process.arguments = args
-            process.standardOutput = Pipe()
+            let pipe = Pipe()
-            process.standardError = Pipe()
+            process.standardOutput = pipe
+            process.standardError = pipe
             do {
-                try process.run()
+                _ = try process.runAndReadToEnd(from: pipe)
-                process.waitUntilExit()
                 return process.terminationStatus
             } catch {
                 return -1

apps/macos/Sources/Clawdbot/Launchctl.swift

@@ -16,12 +16,7 @@ enum Launchctl {
             process.standardOutput = pipe
             process.standardError = pipe
             do {
-                try process.run()
+                let data = try process.runAndReadToEnd(from: pipe)
-                // Read pipe output BEFORE waitUntilExit to avoid deadlock.
-                // If the process writes enough to fill the pipe buffer (~64KB),
-                // it will block until someone reads. Reading first prevents this.
-                let data = pipe.fileHandleForReading.readToEndSafely()
-                process.waitUntilExit()
                 let output = String(data: data, encoding: .utf8) ?? ""
                 return Result(status: process.terminationStatus, output: output)
             } catch {

apps/macos/Sources/Clawdbot/NodePairingApprovalPrompter.swift

@@ -580,11 +580,10 @@ final class NodePairingApprovalPrompter {
             process.standardError = pipe
 
             do {
-                try process.run()
+                _ = try process.runAndReadToEnd(from: pipe)
             } catch {
                 return false
             }
-            process.waitUntilExit()
             return process.terminationStatus == 0
         }.value
     }

apps/macos/Sources/Clawdbot/PortGuardian.swift

@@ -203,10 +203,7 @@ actor PortGuardian {
         proc.standardOutput = pipe
         proc.standardError = Pipe()
         do {
-            try proc.run()
+            let data = try proc.runAndReadToEnd(from: pipe)
-            // Read pipe before waitUntilExit to avoid potential deadlock
-            let data = pipe.fileHandleForReading.readToEndSafely()
-            proc.waitUntilExit()
             guard !data.isEmpty else { return nil }
             return String(data: data, encoding: .utf8)?
                 .trimmingCharacters(in: .whitespacesAndNewlines)

apps/macos/Sources/Clawdbot/Process+PipeRead.swift

@@ -0,0 +1,11 @@
+import Foundation
+
+extension Process {
+    /// Runs the process and drains the given pipe before waiting to avoid blocking on full buffers.
+    func runAndReadToEnd(from pipe: Pipe) throws -> Data {
+        try self.run()
+        let data = pipe.fileHandleForReading.readToEndSafely()
+        self.waitUntilExit()
+        return data
+    }
+}

apps/macos/Sources/Clawdbot/RuntimeLocator.swift

@@ -133,10 +133,7 @@ enum RuntimeLocator {
         process.standardError = pipe
 
         do {
-            try process.run()
+            let data = try process.runAndReadToEnd(from: pipe)
-            // Read pipe before waitUntilExit to avoid potential deadlock
-            let data = pipe.fileHandleForReading.readToEndSafely()
-            process.waitUntilExit()
             let elapsedMs = Int(Date().timeIntervalSince(start) * 1000)
             if elapsedMs > 500 {
                 self.logger.warning(