Fix tool input reconstruction for approval requests

[threepointone]

Fixes #1872.

What changed

• Accumulate AI SDK tool input text deltas using the current inputTextDelta field and parse them at a safe boundary.
• Preserve compatibility with custom/older streams that provide parsed input on delta chunks.
• Allow a canonical input-available chunk to complete server-side reconstruction after approval-requested without regressing the approval state or rebroadcasting a stale client transition.
• Add regression coverage for both event orderings and the compatibility path.
• Add patch changesets for agents and @cloudflare/ai-chat.

Reproduction

Before the fix, the new regression cases reproduced the report: streamed arguments remained undefined both when deltas preceded approval and when approval-requested preceded input-available.

Validation

• agents chat suite: 26 files, 517 tests passed
• ai-chat Workers suite: 49 files, 655 tests passed
• affected TypeScript configs passed
• repository formatting and lint passed
• package export validation passed
• sherif passed with the two existing missing-package warnings for examples/harness-deck and examples/think-standalone

No documentation update is needed because this restores internal stream reconstruction behavior without changing the public API.

[changeset-bot]

🦋 Changeset detected

Latest commit: 5aa7ce2

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

This PR includes changesets to release 3 packages

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

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commit: 5aa7ce2