fix(tui): steer user messages into the running turn while a goal is active

[chengluyu]

Related Issue

None — this is a clear, reproducible bug fix; the problem is explained below.

Problem

While a goal is being pursued, the engine holds its single active turn across the whole goal continuation loop. The TUI, however, goes idle at every turn.ended — including each goal continuation boundary — and then sends queued input (drained from its message queue, or typed in the brief idle window) as a fresh prompt. That prompt races the goal driver and is rejected with turn.agent_busy ("Cannot launch a new turn while another turn (ID N) is active"), so the user's message is silently dropped: it appears in the local transcript but never reaches the session history.

What changed

• In the TUI's message-send path, when a goal is active the message is now sent via session.steer instead of session.prompt. The engine buffers steered input into the running goal turn (flushed at the next step / turn boundary, where the model can react to it), or launches a turn of its own if the goal loop just ended — both correct outcomes, with no rejection. When no goal is active, messages still go through prompt exactly as before.
• This follows the engine's designed contract (turn.agent_busy: "Wait for the current turn to finish or steer it") rather than changing engine semantics, so other hosts are unaffected.
• Added message-flow tests covering: fresh input steered while a goal is active even in the idle window, a queued message steered at a goal continuation boundary, and the unchanged prompt path when no goal is active.
• Includes a changeset (@moonshot-ai/kimi-code, patch).

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: 9071abc

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

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[pkg-pr-new]

pnpm dlx https://pkg.pr.new/@moonshot-ai/kimi-code@9071abc

npx https://pkg.pr.new/@moonshot-ai/kimi-code@9071abc

commit: 9071abc

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: ba67dbb33e

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[chengluyu]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: e1485d0fb0

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[chengluyu]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep them coming!

Reviewed commit: 9071abcf06

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".