Fix status code threshold: align implementation with specification

[Copilot]

The nightly audit agent's log analysis was flagging HTTP 400 responses, contradicting both the docstring and AGENTS.md specification which define the threshold as "status codes > 400".

Changes

• Updated condition from >= 400 to > 400 in scripts/nightly_audit_agent.py:121
• HTTP 400 (Bad Request) responses now correctly excluded from audit flagging

# Before
if entry.get('status_code', 0) >= 400:
    self.issues.append({...})

# After  
if entry.get('status_code', 0) > 400:
    self.issues.append({...})

This aligns the implementation with the documented behavior in both the method docstring and the AGENTS.md protocol specification.

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