fix(chat): make durable recovery unconditional

[ben-reitz]

Fixes #2044.

Remove chatRecovery = false

This removes the option to disable durable chat recovery in AIChatAgent and Think. Every chat turn now runs in a recovery fiber. chatRecovery remains available for tuning recovery budgets and terminal behavior.

Previously compiled JavaScript that still supplies false receives the default recovery configuration.

Why the opt-out is unnecessary

The opt-out tied two separate concerns together: durable bookkeeping and automatic continuation. Users may need to prevent another model call, but the SDK still needs a durable record of the running turn.

Issue #2044 exposed one consequence of skipping that record. An agent-tool inspection handled by a fresh JavaScript instance could not see another instance's in-memory stream state. It could throw during inspection or mark a child as failed while that child was still running successfully.

Keeping the durable record for every turn removes that unsafe branch. Applications can still decline automatic continuation without giving up durable bookkeeping.

For existing false users

Remove the assignment. If recovery must not issue another model call, return { continue: false } from onChatRecovery() instead. Cancellation intent, side-effect completion, or spend limits should be stored durably and consulted by that hook; recovery budgets remain available as an additional bound.

Tests

A regression test runs an agent-tool child with the legacy false value, kills it during streaming, and verifies that recovery completes and the parent receives the real terminal result.

Suites: agents chat 514 · AI Chat workers 655 · Think workers 919 · agent-tool recovery E2E · pnpm run check.

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[changeset-bot]

🦋 Changeset detected

Latest commit: cecfb37

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
agents	Minor
@cloudflare/ai-chat	Minor
@cloudflare/think	Minor
@cloudflare/agent-think	Patch

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