Task 6 — Show IQ delta in Optimizer run view

[hiydavid]

Part of #179.

Goal

Surface pre-run vs post-run IQ Scan deltas inside the Optimizer run detail view so users can see what the optimization improved.

Work

• Extend GET /api/auto-optimize/runs/{run_id} to return preflight_scan and postflight_scan objects read from the new genie_opt_scan_snapshots Delta table
• Update frontend/src/components/auto-optimize/RunDetailView.tsx to render IQ scan summary (score, maturity, key findings resolved)
• Extract a shared <ScanSummary /> component if one does not exist; reuse the same visual vocabulary as IQScoreTab.tsx
• Display delta prominently: IQ 8/12 → 11/12 · Ready to Optimize → Trusted
• Show a resolved-checks list: which previously-failing checks now pass
• If postflight scan is missing (run in progress or failed), gracefully show just preflight

Acceptance

• Run detail view clearly shows both preflight and postflight IQ state when available
• Delta rendering handles all edge cases: same score, regression, big jump
• Shared <ScanSummary /> primitive used in both IQ Score tab and Optimizer run view

Files

• backend/routers/auto_optimize.py (extend run detail response)
• backend/models.py (add preflight_scan, postflight_scan to run detail response model)
• frontend/src/components/auto-optimize/RunDetailView.tsx
• frontend/src/components/ScanSummary.tsx (new)
• frontend/src/pages/IQScoreTab.tsx (refactor to reuse ScanSummary)
• frontend/src/types/index.ts

[hiydavid]

Partially addressed by PR #202 (fix/gso-optimizer-correctness-and-leakage).

Shipped:

• Backend snapshots persist via Task 5 — UC Delta persistence for Optimizer-linked scan snapshots #184 (genie_opt_scan_snapshots UC Delta table, preflight + postflight write paths).
• A 14th iq_scan_findings tile added to FailureAnalysisStage.tsx.

Still TODO for full acceptance:

• Shared <ScanSummary /> primitive used by both IQ Score tab and run view
• Pre/post IQ delta + resolved-checks list rendered in RunDetailView.tsx
• Extend GET /api/auto-optimize/runs/{run_id} with preflight_scan / postflight_scan fields
• Add preflight_scan/postflight_scan fields to backend/models.py

Keeping open. Not in PR #202's Closes set; deferred to a follow-up.