🛡️ Sentinel: [HIGH] Fix Path Traversal in LocalJsonStore

[hackerxj2010]

🚨 Severity: HIGH
💡 Vulnerability: Path Traversal in LocalJsonStore
🎯 Impact: An attacker could read, write, or delete arbitrary JSON files outside the intended base directory by using .. segments in the store key.
🔧 Fix:

• Filter out . and .. segments from the key.
• Support both / and \ as path separators for cross-platform robustness.
• Validate the resolved path against the base directory using path.resolve and a startsWith check with a trailing separator to prevent prefix bypass attacks.
  ✅ Verification:
• Created a new security test suite packages/documents/src/security.test.ts which covers read, write, and delete traversal attempts.
• Verified that all tests pass using pnpm exec vitest run packages/documents/src/security.test.ts.
• Ran the full monorepo test suite with pnpm test to ensure no regressions.

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PR created automatically by Jules for task 10957113255016934380 started by @hackerxj2010

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