[codex] Simplify backtesting helpers

[david30907d]

Summary

• Factor the small useBacktestConfiguration regression test setup into local helpers and type the strategy config fixture.
• Derive valid backtesting actions from ActionType instead of duplicating the literal set.
• Extract the repeated asset bucket clamp in PortfolioBuckets.asset_allocation.
• Cache nested public params schema generation with lru_cache.

Validation

• pnpm --filter @zapengine/frontend exec vitest run tests/unit/hooks/backtesting/useBacktestConfiguration.test.ts
• pnpm --filter @zapengine/frontend type-check
• pnpm --filter @zapengine/frontend lint
• pnpm --filter @zapengine/analytics-engine test
• pnpm --filter @zapengine/analytics-engine type-check
• pnpm --filter @zapengine/analytics-engine lint
• Pre-commit pnpm check:local passed during commit, including affected frontend and analytics tests plus strategy snapshot check with 0 drift.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
zap-engine-frontend	Ready	Preview, Comment	May 14, 2026 0:26am
zap-engine-landing-page	Ready	Preview, Comment	May 14, 2026 0:26am