fix(session): remove compaction summary dividers (#24677)

packages/opencode/src/session/compaction.ts

@@ -37,8 +37,8 @@ const PRUNE_PROTECTED_TOOLS = ["skill"]
 const DEFAULT_TAIL_TURNS = 2
 const MIN_PRESERVE_RECENT_TOKENS = 2_000
 const MAX_PRESERVE_RECENT_TOKENS = 8_000
-const SUMMARY_TEMPLATE = `Output exactly this Markdown structure and keep the section order unchanged:
----
+const SUMMARY_TEMPLATE = `Output exactly the Markdown structure shown inside <template> and keep the section order unchanged. Do not include the <template> tags in your response.
+<template>
 ## Goal
 - [single-sentence task summary]
 
@@ -66,7 +66,7 @@ const SUMMARY_TEMPLATE = `Output exactly this Markdown structure and keep the se
 
 ## Relevant Files
 - [file or directory path: why it matters, or "(none)"]
----
+</template>
 
 Rules:
 - Keep every section, even when empty.