[0.7.1] — 2026-05-20

Hotfix for a race condition in the MRP REFINE phase that surfaced while
compiling longer source documents (observed on
meeting-notes-260519-2124-chien…). No schema migration, no API change.

Fixed

• MRP REFINE concurrent-session race — Phase 3 fanned out up to
  MAX_WRITER_CONCURRENCY page writers via asyncio.gather, all
  sharing the orchestrator's single AsyncSession. SQLAlchemy
  AsyncSession is not safe for concurrent use, so simultaneous
  get_page_by_slug lookups (UPDATE fetches plus the read_kb_page
  tool inside the complex writer's agent loop) raced and corrupted
  the session, causing intermittent draft generation failures on
  documents with several UPDATE pages or a large existing wiki.
  Each _write_one now opens its own session from
  async_session_factory; the orchestrator's session is reserved for
  the final plan.plan_json commit.