🛡️ Sentinel: Fix pipe buffer deadlock causing DoS in process execution

[acebytes]

🚨 Severity: HIGH
💡 Vulnerability: A Denial of Service (DoS) vulnerability existed when using Foundation.Process to execute shell commands because the parent process called process.waitUntilExit() before fully reading the child's standard output pipe. If the child process output exceeded the OS pipe buffer limit (typically 64KB), the child would block writing to the full pipe while the parent blocked waiting for the child to exit, causing the application to hang indefinitely.
🎯 Impact: A local attacker or simply an application state producing large command output could freeze the Cacheout application or daemon, preventing subsequent cache operations or monitoring tasks.
🔧 Fix: Reordered the calls to consume the pipe output (readDataToEndOfFile()) before or concurrently with waitUntilExit() in CacheCategory.swift and CacheoutViewModel.swift, adhering to safe Process execution practices.
✅ Verification: Verified that Foundation.Process invocations correctly read output before calling waitUntilExit(). Test script executed to confirm the syntax and structure are preserved.

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PR created automatically by Jules for task 15521284356069803461 started by @acebytes

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