Preserve spaces in positioned PDF text

[puneetdixit200]

Summary

• detect pdfminer output that has lost word boundaries in positioned PDF text and use pdfplumber’s tighter text extraction for those plain-text pages
• avoid treating space-starved prose pages as form/table pages
• add a regression test for the plain-text fallback path

Fixes #120

Testing

• UV_CACHE_DIR=/tmp/markitdown-uv-cache uv run --project . --extra pdf --with pytest pytest tests/test_pdf_memory.py::TestPdfMemoryOptimization::test_space_starved_pdfminer_output_uses_pdfplumber_text -q
• UV_CACHE_DIR=/tmp/markitdown-uv-cache uv run --project . --extra pdf --with pytest pytest tests/test_pdf_memory.py tests/test_pdf_tables.py tests/test_pdf_masterformat.py -q
• UV_CACHE_DIR=/tmp/markitdown-uv-cache GITHUB_ACTIONS=true uv run --project . --all-extras --with pytest --with openai pytest -q
• UV_CACHE_DIR=/tmp/markitdown-uv-cache HATCH_ENV_TYPE_VIRTUAL_PATH=/tmp/markitdown-hatch-envs GITHUB_ACTIONS=true uv run --with hatch hatch test
• UV_CACHE_DIR=/tmp/markitdown-uv-cache PRE_COMMIT_HOME=/tmp/markitdown-pre-commit uv run --with pre-commit pre-commit run --all-files
• git diff --check

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