[WIP] Split audit_report_render.go into domain-focused render files

[Copilot]

• Create pkg/cli/audit_render_overview.go with: renderJSON, renderConsole, renderAuditComparison, renderOverview, renderMetrics, renderJobsTable
• Create pkg/cli/audit_render_tools.go with: renderToolUsageTable, renderMCPToolUsageTable, renderMCPServerHealth
• Create pkg/cli/audit_render_security.go with: renderGuardPolicySummary, renderFirewallAnalysis, renderRedactedDomainsAnalysis, renderPolicyAnalysis
• Create pkg/cli/audit_render_insights.go with: taskDomainDisplay, behaviorFingerprintDisplay, renderTaskDomain, renderBehaviorFingerprint, renderAgenticAssessments, renderKeyFindings, renderRecommendations
• Create pkg/cli/audit_render_metrics.go with: renderPerformanceMetrics, formatUnixTimestamp, renderEngineConfig, renderPromptAnalysis, renderSessionAnalysis, renderCreatedItemsTable, renderSafeOutputSummary, renderTokenUsage
• Delete original pkg/cli/audit_report_render.go
• Run make fmt and audit-related tests to verify