[SESSION_127] SummaryAgent: Implement Monthly Report Generation (Phase 23)

Feature: Monthly Report Generation

Component: SummaryAgent (/agents/summary_agent/)
Severity: 🔴 CRITICAL BLOCKER
Session: SESSION 127 (Definition of Done)
Current Status: Stub returns empty report
Target Phase: Phase 23

Context

SummaryAgent currently generates daily and weekly reports but lacks monthly reporting capabilities. Monthly reports are essential for strategic planning and capacity analysis.

Requirements

• Generate monthly reports with capacity planning insights
• Analyze trends across 30-day periods
• Identify patterns and anomalies
• Provide actionable recommendations for month-ahead planning

Impact

Without this feature:

• Cannot provide month-level insights for strategic planning
• Defeats weekly/monthly reporting purpose
• Users cannot plan capacity or identify long-term trends

Effort Estimate

• Implementation: 8 hours (time-series analysis, aggregation)
• Testing: 3-4 hours (scenario testing, edge cases)
• Documentation: 2 hours
• Total: 12-15 hours

Current Implementation Status

• Completion: 45% (3/7 report types implemented)
• Tests: 91% interface coverage, only 25% behavioral
• Blocker: No trend analysis implementation

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Generated by SESSION 127 FASE 2.7 (Cross-Session Issue Tracking)