Harden Zest adapter initialization gate

[MickeeJay]

Summary

• Require Zest configuration before fee collection and emergency exit entrypoints.
• Preserve the existing treasury and authorization guards.
• Add regression coverage for uninitialized Zest calls.

Validation

• npm run check --workspace=contracts
• git diff --check

Closes #33

[vercel]

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Project	Deployment	Actions	Updated (UTC)
v-mind	Ready	Preview, Comment	Apr 16, 2026 8:10am