v1.0.52

Changes

Summary

• Anthropic rejects role: "tool" (OpenAI convention) with HTTP 400 — expects tool_result blocks inside a user message.
• _extract_system_and_messages previously stripped only the system message and passed everything else through, so any tool-using conversation against Claude failed on the second turn.
• Now translates assistant tool_calls → tool_use blocks, and role: "tool" results → tool_result blocks merged into a single user turn. Applied to both sync and async drivers.

Context

Discovered while debugging Peak Seven OS chat failures: 9 of 10 production failures across ~3 weeks were this exact 400 — messages: Unexpected role "tool". Always on claude/claude-opus-4-6, always on tool-using prompts ("Which clients are at risk?").

Test plan

• dev CI passed (tests + dev-pre-release publish)
• prompture==1.0.52.dev1 published to PyPI
• Merging this PR triggers publish.yml → final 1.0.52 release

Details

• Version: v1.0.52
• PR: #79 by @jhd3197
• PR URL: #79