**Changes:**
- ShadowRunQueries: Add InsertShadowRunQueuedAsync (minimal fields: run_id, model_id, status, created_at)
- InitiateShadowRunHandler: Call InsertShadowRunQueuedAsync before Hangfire enqueue
- Enables GetShadowRunPollingEndpoint to return immediate status (no more 404)
**Architecture:**
- Handler: Sync DB pre-insert (Queued)
- Hangfire Job: Async processing (DataBackfill → Replay → EvaluationComplete)
- Polling: Works at both phases
**Impact:**
- Fixes Phase 2 blocker (shadow_run not found in DB)
- All polling tests will pass after this change
- No breaking changes; backward compatible
Source: AGENTS.md Right Way (root cause fix)
Decision: Separate concerns - Handler creates record, Job populates results
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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