Cache live Zest balance reads

[MickeeJay]

Summary

• Added a cache-backed live sync path for Zest balance reads.
• Non-mock get-vault-zest-underlying-balance now fails closed until live reserve data has been synced.
• Mock mode still returns proportional balances from the local test double.

Validation

• npx vitest run tests/unit/zest-adapter.test.ts --config vitest.config.ts
• npm run check
• npm test

Closes #34

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Project	Deployment	Actions	Updated (UTC)
v-mind	Ready	Preview, Comment	Apr 16, 2026 2:33pm