🔒 Fix potential command injection/path traversal in nerd tool run

[theRebelliousNerd]

🎯 What: Prevented unauthorized execution by validating the tool binary path before running it in cmd/nerd/cmd_advanced.go.
⚠️ Risk: The previous code pulled binaryPath from a Mangle kernel fact tool_binary_path without checking if the binary actually belonged to the internal compiled tools directory. If an attacker managed to assert a malicious tool_binary_path (e.g. ../../../../bin/bash), they could execute arbitrary binaries with the same privileges as the agent.
🛡️ Solution: Ensure absolute path resolution for both the target binary and the expected directory (.nerd/tools/.compiled). Use filepath.Rel to explicitly verify that the binary resides strictly within the compiled directory, effectively preventing path traversal escapes and executing untrusted/unexpected binaries on the host system.

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PR created automatically by Jules for task 10118650433690199416 started by @theRebelliousNerd

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

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📥 Commits

Reviewing files that changed from the base of the PR and between cc0e10f and 394b68a.

📒 Files selected for processing (2)

• cmd/nerd/cmd_advanced.go
• pr_description.txt

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jules-10118650433690199416-e531a86a

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