🛡️ Sentinel: [CRITICAL] Fix Resource Exhaustion (DoS) in Shell and Network Tools

[thirdbase1]

🚨 Severity: CRITICAL
💡 Vulnerability: External operations (shell command execution and network requests) were unbound, allowing potential infinite execution, memory exhaustion, or deadlocks due to malicious input or hung processes.
🎯 Impact: A Denial of Service (DoS) attack could occur, crashing the host agentic execution environment.
🔧 Fix: Enforced strict resource limits on execAsync (timeout and buffer limits) in ShellTool.run() and axios.post (timeout) in AgentConnector.chat().
✅ Verification: Ran npm run test and npm run build successfully. All test cases passed.

This PR implements resource constraints to improve the overall security of oneshotsx.

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PR created automatically by Jules for task 16365576086355188092 started by @thirdbase1

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