feat(evi): enable zero data retention on the gateway

[evlogai]

What

Enable zero data retention (ZDR) on every AI Gateway request made by the Evi agent by adding zeroDataRetention: true to the shared gatewayRouting in apps/evi/agent/lib/gateway.ts. Both model paths in agent.ts spread this routing, so all agent sessions route only through ZDR-compliant providers.

Why

The agent's gateway traffic currently runs without ZDR (report grouping by zero_data_retention returns no-zdr-requested for all rows). Per-request ZDR is free on Pro/Enterprise. The default model deepseek/deepseek-v4-flash has ZDR-compliant providers on AI Gateway, so this does not break routing.

Notes

• ZDR skips BYOK keys by default and fails closed: if a model has no ZDR-compliant provider the request errors rather than silently downgrading. The default and eval models both have ZDR coverage today.
• The eval judge (evals.config.ts) uses its own gateway options with only tags, so it is untouched by this change.
• The change is confined to apps/evi (internal agent), so no changeset is required.

Checks

• pnpm run lint: 22 tasks successful, exit 0
• pnpm --filter evi run typecheck: exit 0
• pnpm run test: 1811 tests / 87 files passed
• pnpm --filter evi exec vitest run agent/lib/gateway.test.ts: 4 passed (includes a new assertion that gatewayRouting.zeroDataRetention is true)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 6e5a2b2

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Project	Deployment	Actions	Updated (UTC)
evi	Ready	Preview	Aug 12, 2026 4:45pm

4 Skipped Deployments

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evlog-docs	Skipped		Aug 12, 2026 4:45pm
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evlog-telemetry	Skipped		Aug 12, 2026 4:45pm
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[github-actions]

Thank you for following the naming conventions! 🙏

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commit: 4b7dc1c