Timestamp Validation

[vuneum]

🧩 Problem

Missing lower-bound checks and clock drift handling.

⚠️ Impact

Replay attacks + false validation failures.

📍 Area

PoE / Security

🧠 Root Cause

Incomplete timestamp validation logic.

🛠 Proposed Fix

• Add PAST_TIMESTAMP check
• Configurable tolerance
• Monotonic check per agent

📊 Priority

P0

✅ Acceptance Criteria

• Replay attacks prevented
• Clock drift handled