M13: Run conversion, OCR and optimization over folder trees (#1605)
Add a shared CLI/MCP batch runner with bounded discovery, retained relative
paths and per-file processing in isolated engine sessions. Publish complete
outputs without overwriting existing names, and return structured errors
with an optional stop-on-error policy.
Cover recursive jobs, overlapping inputs, concurrent output collisions,
root confinement and partial-failure reporting in automation and CLI tests.
Co-authored-by: LabDennis <341377186+LabDennis@users.noreply.github.com>
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