v0.5.3

• Fixed: the conversion engines' own logging buried everything else.
  Converting a 34-page PDF wrote 113 lines to stderr, 107 of them from docling
  and its model stack — torch dynamo graph-break notices, and one warning per
  page reporting that OCR found no text, which is the normal case for a
  born-digital PDF rather than a problem.

  It made the progress output added in 0.5.2 effectively invisible, and the wall
  of yellow WARNING lines read like a failure on a conversion that had actually
  succeeded. Same document now writes 7 lines.

  Anything at ERROR or above still comes through. docsift convert --verbose,
  or DOCSIFT_VERBOSE=1 for the MCP server and HTTP API, restores every line —
  which is what a bug report needs.