feat: Complete MSA (Multi-Service Analyzer) - Priority #3 ✅

Implements automated GCP release notes monitoring and impact assessment.
Analyzes security, billing, and compliance impacts for active services only.

Key Features Delivered:
- RSS feed monitoring of https://cloud.google.com/release-notes
- Security impact assessment (critical updates, auth changes, vulnerabilities)
- Billing impact analysis (pricing changes, cost optimizations)
- Compliance impact tracking (certifications, regulations)
- Active service filtering (only analyzes services in use)
- Risk scoring and prioritized recommendations
- Cloud Function for automated daily monitoring
- Pub/Sub alerts for critical issues
- BigQuery storage for historical tracking

Implementation:
- agents/_tools/msa_analyzer.py (700+ lines)
- cloud_functions/msa_analyzer/ (ready for deployment)
- Cloud Scheduler integration for daily runs
- Caching to avoid duplicate processing

Test Results:
- Successfully fetched live GCP release notes
- Identified critical security updates requiring immediate action
- Generated risk-based recommendations with deadlines
- Overall risk assessment working (low/medium/high)

Business Impact:
- Proactive notification of service changes
- Automated impact assessment across security/billing/compliance
- Prioritized action items with deadlines
- Reduced manual monitoring effort

This addresses stakeholder priority #3:
'MSA (Multi-Service Analyzer) - New requirement from stakeholder feedback'

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

Author: stuagano