fix: project persisted context messages

[kermanx]

Related Issue

No linked issue. This follows maintainer-requested cleanup of context projection behavior.

Problem

Context projection was dropping persisted UserPromptSubmit hook results and blocked prompts before building model input. It also kept an unused ephemeral injection API and relied on message text envelopes to decide whether adjacent user messages could be merged, which made projection behavior harder to reason about from message metadata.

What changed

• Removed the unused ephemeral injection argument and rendering path from context projection.
• Project persisted hook results and blocked prompt records into model context while still filtering partial messages and empty assistant placeholders.
• Merge adjacent user messages only when both messages have real user origin, keeping synthetic or missing-origin user-role messages separate.
• Updated hook documentation, changeset, and tests/snapshots for the new projection behavior.

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: 04bfa4c

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

This PR includes changesets to release 2 packages

Name	Type
@moonshot-ai/agent-core	Patch
@moonshot-ai/kimi-code	Patch

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[pkg-pr-new]

pnpm dlx https://pkg.pr.new/@moonshot-ai/kimi-code@04bfa4c

npx https://pkg.pr.new/@moonshot-ai/kimi-code@04bfa4c

commit: 04bfa4c