fix(kimi-code): render v2 background task notifications on session replay

[liruifengv]

Related Issue

No linked issue — the problem is explained below.

Problem

When the TUI runs on the v2 engine, resuming a session renders background-task terminal notifications as raw <notification ...> XML user messages instead of the usual task status card.

The v2 engine persists these notifications with prompt origin kind task (renamed from v1's background_task), and both spellings reach the replay verbatim. The TUI's replay path only recognized the legacy spelling, so a v2-spelled notification fell through every special-case branch and landed in the generic user-message renderer, leaking the protocol XML into the visible transcript.

What changed

• The replay's background-task origin gate now accepts both spellings (background_task and task). The v2 spelling is declared as a local origin type because the SDK's PromptOrigin union only carries the v1 vocabulary; both shapes share the same taskId / status / notificationId fields and identical status value sets, so the status-card renderer works unchanged — only its parameter type was widened.
• Added a replay test feeding a v2-spelled completion notification: it renders as the bash task status card, and the test also asserts the raw notification XML never appears as a user message. The existing v1-spelling test keeps guarding the legacy path.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: 676a67e

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

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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commit: 676a67e