v0.5.3

v0.5.3 Release Notes

This patch release improves capture_sheet_images subprocess reliability and
observability, and updates MCP guidance for safe production rollout.

Highlights

• Added dedicated subprocess worker entrypoint:
  • python -m exstruct.render.subprocess_worker is now used for
    capture_sheet_images subprocess mode.
  • worker bootstrap is decoupled from parent __main__ restoration.
• Updated default runtime behavior:
  • MCP now defaults EXSTRUCT_RENDER_SUBPROCESS=1 based on profile-comparison
    runs showing stable behavior in both modes.
  • EXSTRUCT_RENDER_SUBPROCESS=0 remains available to force in-process mode.
• Improved timeout and failure diagnostics:
  • wait ordering now prioritizes result receipt before join wait to reduce
    false timeout failures after successful worker output.
  • stage-aware error reporting (startup / join / result / worker) now
    includes actionable context and stderr snippets when available.
• Documentation updates:
  • MCP exstruct_capture_sheet_images is marked Experimental.
  • README/MCP docs now include subprocess timeout tuning guidance, including
    EXSTRUCT_RENDER_SUBPROCESS_STARTUP_TIMEOUT_SEC.

Notes

• No new patch operations were added in this release.
• MCP tools include the experimental exstruct_capture_sheet_images path updated in this release.
• This is a reliability-focused patch release for image-capture execution paths.