test: cover recovery after forced Durable Object eviction

[mattzcarey]

Summary

Test-only coverage for recovery after a running Durable Object is explicitly evicted with evictDurableObject() / evictAllDurableObjects().

• verifies volatile instance state is dropped while SQLite and Durable Object storage are retained
• covers Agent state, schedules and fibers; Session active-leaf reconstruction; MCP startup/session restoration; AIChat history, streams and WebSockets; Codemode durable replay; Workspace; Think startup/recovery; and Voice history
• keeps a live AIChat WebSocket usable across forced eviction and separately covers { webSockets: "close" }
• adds no runtime code or changeset

Scope

This proves selected reconstruction paths after forced eviction. It does not prove natural idle hibernation, timer absence, hibernation eligibility, or duration-billing suspension.

Related to #1956; does not fix it. The test helper bypasses the eligibility gate, so a passive workerd/vitest-pool API is still needed to detect timer-pinned actors without waking or forcibly evicting them.

Verification

• pnpm run build
• pnpm run check
• CI=true pnpm exec nx affected -t test --base=origin/main --parallel=3

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Latest commit: 321b953

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commit: 321b953

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✅ Devin Review: No Issues Found

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