[7Sageer]

Requirement or Bug

区分导入时「预算不够」和「装完再称仍超预算」两种失败，并去掉会被覆盖的图片块计数。

Bug Reproduction Steps

N/A

Root Cause

N/A

Code Changes

 renderHistory
   if reserve or no turn fits
     throw INSUFFICIENT_TOKEN_BUDGET
   assemble message
-  if estimate exceeds budget
-    throw Error without code  → CONVERSION_FAILED
+  if estimate exceeds budget
+    throw BUDGET_ACCOUNTING_FAILED

 makeSteps
-  image or document block: increment imageBlocks or documentBlocks
+  document block: increment documentBlocks
+  image block: do not increment
 readClaudeSession
   imageBlocks = imageReferences.contentReferences

Behavior Changes and Affected Users

Behavior	Before	After	Who relies on the old behavior	Escape hatch
装完再称仍超预算时 convertSession 的 error.code	无码，落成 CONVERSION_FAILED	BUDGET_ACCOUNTING_FAILED	按这个码分支的 convertSession 调用方。CLI 导入页只显示原句，不看码	无。失败句子不变
导入页失败行	Rendered import exceeded its token budget.	同一句	使用 /import-sessions 或 kimi import-sessions 的人	无变化
stats.imageBlocks	遍历加一后被 contentReferences 覆盖	只赋值为 contentReferences	读完整历史附件里该字段的脚本。现有测试断言的就是覆盖后的数	无。发布出去的数不变

受影响模块：packages/session-import。pnpm --filter @moonshot-ai/session-import test，195 项通过。没有能打中 BUDGET_ACCOUNTING_FAILED 的现有用例，这次也不新写。

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue (external PRs: issue must have a maintainer's /approve).
• I have added tests that prove my feature works.
• The behavior-change table above is complete, and every removed behavior or flipped default is named in the changeset and either has an escape hatch or was explicitly approved by a maintainer in this PR.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

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[7Hanrui]

@codex review

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-26T13:16:28.282922Z	a23920d	Manual request

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[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Delightful!

Reviewed commit: a23920d0e7

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