fix: 🛡️ Sentinel: [HIGH] Fix Insecure Temporary File Creation for SSH Configs

[Hardonian]

🎯 What: Replaced the insecure temporary file creation for SSH configs with a securely generated directory using fs.mkdtempSync.

⚠️ Risk: The previous implementation used predictable file paths (nemoclaw-state-${process.pid}-${Date.now()}.conf) within the global temporary directory (os.tmpdir()). This made the system susceptible to symlink or file pre-creation attacks, where a malicious actor could intercept, read, or manipulate sensitive SSH configurations or escalate privileges.

🛡️ Solution: Updated writeTempSshConfig in src/lib/state/sandbox.ts to use fs.mkdtempSync to create a uniquely named, securely permissioned (0700) temporary directory. The ssh_config.conf is now placed safely inside this directory. Also ensured safe cleanup of both the file and the temporary directory after use.

✅ Verification: Verified that tests pass via pnpm test and npm run verify:core, ensuring no regressions in functionality.

Signed-off-by: Jules jules@example.com

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PR created automatically by Jules for task 661867280316128939 started by @Hardonian

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