[DRAFT] Feature: add MessagesSave to model layer

[garyzhang99]

AgentScope Version

• 1.0.6 (latest)

Description

• Add first-class “messages saving” for both non-streaming and streaming model calls.

Changes

• New agentscope.model._messages_save with MessagesDataCollector (JSONL).
• ChatModelBase gains save_messages: bool, save_path: str | None.
• Update OpenAI/Anthropic/DashScope/Ollama/Gemini to:
  • accept new params
  • save after non-stream completion
  • wrap streams to save once at end
• Export MessagesDataCollector, enable_messages_save from agentscope.model.

Usage

• Initialize models with save_messages=True, save_path=".../out.jsonl".

Status

• DRAFT (naming/placement feedback welcome; need actual sft test; docs to follow).

Checklist

Please check the following items before code is ready to be reviewed.

• Code has been formatted with pre-commit run --all-files command
• All tests are passing
• Docstrings are in Google style
• Related documentation has been updated (e.g. links, examples, etc.)
• Code is ready for review

[github-actions]

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