docs: Add WBS Progress Tracker (Source of Truth for completion status)
Per AGENTS.md v16.0 Traceability Criterion:
- Track completion status in WBS_PROGRESS_TRACKER.csv
- Link evidence artifacts to each completed item
- Status: PLANNED / IN_PROGRESS / COMPLETED / BLOCKED / RUNNING
Session 2026-08-04 Summary:
- S0 (AEG-X-007, AEG-X-008, AEG-VS-00-01~07): COMPLETED (7 items)
- S0-S5 (Phase 2-4 automation): COMPLETED (deployment, runbook, monitoring, debt)
- S0-S5 (Phase 1 shadow run): RUNNING (Job 976, 50-90 days)
- S1-S5 (Future phases): BLOCKED pending Phase 1
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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