Add gcp-artifact-registry-spend-analysis CodeBundle

[rw-codebundle-agent]

Summary

• Adds gcp-artifact-registry-spend-analysis CodeBundle for issue automatic-index-update #133 (parent automatic-index-update #132)
• Queries BigQuery billing export for Artifact Registry and legacy GCR SKUs with spend breakdown, top contributors, MoM comparison, anomaly detection, and optimization recommendations
• Includes in-repo sli.robot scoring anomaly signals, MoM growth, and project spend concentration (0–1 health score)

Design spec alignment

• Implements all five tasks from the design spec with configurable thresholds via env vars
• Reuses billing export query patterns from gcp-project-cost-health
• Uses project resource type (collection convention; spec listed gcp_projects)
• BigQuery billing export does not expose repository names; recommendations cross-reference gcp-artifact-registry-governance

Scoring

• Self-check: 104/104 (python -m scorer.score codebundles/gcp-artifact-registry-spend-analysis)

Test plan

• Static structure validation: cd codebundles/gcp-artifact-registry-spend-analysis/.test && task
• Run runbook against a workspace with BigQuery billing export access
• Verify SLI health score drops when MoM growth or project concentration thresholds are breached
• Confirm legacy GCR SKU detection in report-top-artifact-cost-contributors.sh

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