🛡️ Sentinel: [HIGH] Fix command injection in toolExists and remove bash wrappers

[acebytes]

🚨 Severity: HIGH
💡 Vulnerability: toolExists in CacheCategory used string interpolation to execute a bash wrapper shell("/usr/bin/which \(tool)"). This introduces a severe command injection vector. Similarly, dockerPrune in CacheoutViewModel relied on a bash wrapper /bin/bash -c "docker system prune -f 2>&1", introducing unnecessary shell interpreters.
🎯 Impact: If toolExists were ever passed untrusted or malformed input, it could execute arbitrary commands on the host under the user's privilege context.
🔧 Fix:

• Replaced the bash wrapper shell() call in toolExists with a direct invocation of /usr/bin/which using Process(), placing the dynamic tool securely within the .arguments array to avoid shell expansion and string manipulation.
• Hardened dockerPrune() to skip the bash wrapper by executing /usr/bin/env directly with ["docker", "system", "prune", "-f"] arguments, securely replacing the 2>&1 bash redirect by assigning both standardOutput and standardError to the same Pipe() instance.
  ✅ Verification: Verified syntax and process configuration via manual review. Environment does not currently support swift for local test execution.

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PR created automatically by Jules for task 2728279559680772638 started by @acebytes

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