perf: shrink conflict map static payloads

[svg8bit]

Summary

• keep the existing 5-minute static ISR path; no extra Polymarket requests per visitor
• compact the two runtime Natural Earth GeoJSON sources and round geometry to sub-pixel precision
• add deterministic generation/check commands with hard payload budgets
• make the map benchmark record alerts without blocking map drag/zoom runs when the rail is empty

Measured result

• runtime GeoJSON raw: 233,538 B -> 195,503 B (-16.3%)
• local gzip transfer: 73,366 B -> 58,421 B (-20.4%)
• quality-11 Brotli estimate: 54,906 B -> 42,809 B (-22.0%)
• world visual diff: 0.178% (8% gate)
• regional visual diff: 0.333% (8% gate)

Geobuf was measured but not added: its compact binary payload plus the required browser decoder was larger than compact Brotli GeoJSON and would move decoding out of MapLibre worker handling.

Verification

• npm run check
• npm run test:e2e (32 passed)
• byte-for-byte asset generation idempotence
• constrained and Slow 4G benchmark smoke
• tracked/untracked secret scan

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Project	Deployment	Actions	Updated (UTC)
oddsfront	Ready	Preview	Aug 21, 2026 8:17pm

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[chatgpt-codex-connector]

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