feat(session): add backward-compatible working_memory context field MVP

[yeyitech]

Summary

• implement the 【RFC】OpenViking工作记忆设计v1 #1481 working memory object MVP as a new backward-compatible working_memory field in get_session_context()
• populate working_memory.markdown from the latest archive overview plus a compact recent conversation tail
• keep legacy latest_archive_overview, pre_archive_abstracts, and message payloads unchanged so existing callers continue to work
• update the OpenClaw example client to prefer working_memory.markdown while falling back to latest_archive_overview

Testing

• npm test -- --run tests/ut/context-engine-assemble.test.ts tests/ut/context-engine-compact.test.ts
• manual unit-style verification of Session.get_session_context() / working-memory markdown assembly in Python

Notes

• scoped intentionally as the MVP discussed in 【RFC】OpenViking工作记忆设计v1 #1481
• backward compatible field addition only; no existing context fields are removed or renamed

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[github-actions]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 3 🔵🔵🔵⚪⚪

🏅 Score: 92

🧪 PR contains tests

🔒 No security concerns identified

✅ No TODO sections

🔀 No multiple PR themes

⚡ Recommended focus areas for review Edge Case Handling _build_working_memory_markdown returns an empty string when there is no latest archive overview, even if recent conversation tail messages are available. This might omit useful context in sessions without archived summaries. def _build_working_memory_markdown( self, latest_archive_overview: str, merged_messages: List[Message], ) -> str: """Build a compact working-memory markdown block for downstream clients.""" overview = (latest_archive_overview or "").strip() if not overview: return "" sections = [overview] tail_messages = merged_messages[-_WORKING_MEMORY_TAIL_MAX_MESSAGES:] if tail_messages: sections.append("## Current Conversation Tail") sections.extend(self._format_working_memory_message(message) for message in tail_messages) return "\n\n".join(section for section in sections if section).strip()

[github-actions]

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
Possible issue	Include tail messages in working memory even without archive The current implementation returns an empty working memory markdown if there is no latest archive overview, even when there are tail messages available. This limits the utility of the working memory for sessions without archives. Modify the method to include tail messages even when no archive overview is present, and only return empty if both overview and tail messages are missing. openviking/session/session.py [833-848] def _build_working_memory_markdown( self, latest_archive_overview: str, merged_messages: List[Message], ) -> str: """Build a compact working-memory markdown block for downstream clients.""" overview = (latest_archive_overview or "").strip() - if not overview: - return "" - - sections = [overview] + sections = [] + if overview: + sections.append(overview) + tail_messages = merged_messages[-_WORKING_MEMORY_TAIL_MAX_MESSAGES:] if tail_messages: sections.append("## Current Conversation Tail") sections.extend(self._format_working_memory_message(message) for message in tail_messages) + return "\n\n".join(section for section in sections if section).strip() Suggestion importance[1-10]: 6 __ Why: The suggestion corrects a limitation where working memory markdown was empty even when tail messages existed, as long as there was no archive overview. This improves the utility of the working memory for sessions without archives.	Low