fix: 🛡️ Sentinel: [HIGH] Fix Weak Hashing Algorithm (SHA256 without salt)

[Hardonian]

🎯 What

The hashCredential function previously used an unsalted SHA-256 algorithm to hash credentials, which is insecure and vulnerable to rainbow table attacks and brute-forcing.

⚠️ Risk

If an attacker gains access to the local sandbox state or the registry payload where these hashes are stored, they could rapidly compute plaintexts using hardware acceleration or pre-computed hash tables, compromising the messaging bridge tokens or router credentials.

🛡️ Solution

• Migrated the hashing implementation to use Node.js's native crypto.scryptSync with a random 16-byte salt per hash.
• Implemented verifyCredential using crypto.timingSafeEqual to securely compare plaintexts against stored salted hashes.
• Retained a fallback in verifyCredential to support legacy, unsalted SHA-256 hashes for backwards compatibility with existing active deployments.
• Updated conflict detection logic to pass plaintexts safely for in-memory resolution where strict equality checks on hashes are mathematically impossible with distinct salts.

Signed-off-by: Jules jules@nemo.claw

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PR created automatically by Jules for task 7495761229841664717 started by @Hardonian

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