fix(compact): soften English checkpoint rule

packages/compact/compact-basic/README.zh.md

@@ -107,7 +107,7 @@ This is an automatically generated checkpoint condensing an earlier span of the
 ##### 压缩指令（最终 user 消息）
 
 ```markdown
-You are now acting as a compaction engine for this AI coding assistant. Produce only an English-language internal engineering checkpoint that condenses the conversation ABOVE into a structured checkpoint that lets another model resume the work with no loss of essential context. Translate narrative source material as needed; preserve exact literals.
+You are now acting as a compaction engine for this AI coding assistant. Condense the conversation ABOVE into a structured checkpoint that lets another model resume the work with no loss of essential context.
 
 Output EXACTLY the Markdown structure below: keep every section, in order. Use terse bullets, not prose paragraphs. Write "(none)" for an empty section — never drop a section.
 
@@ -136,7 +136,7 @@ Output EXACTLY the Markdown structure below: keep every section, in order. Use t
 - [decisions and their rationale, constraints, user preferences, open questions, data needed to continue]
 
 Rules:
-- Preserve exact file paths, commands, error strings, identifiers, and function signatures.
+- Write concise English engineering prose. Preserve exact file paths, commands, error strings, identifiers, numeric values, function signatures, and syntax fragments.
 - Capture user feedback and explicit instructions faithfully, especially corrections.
 - Do NOT mention this summarization request or that the context was compacted.
 - Output only the checkpoint text: do not call any tool or take any other action.