[Final Evaluation] Restore real working logic across all modules overwritten by PR #9

[M-O-J-U]

What does this PR do?

Restores the actual, tested implementations of preprocessor.py, ocr.py, and parsers/cnic.py. PR #9 (an automated Copilot fix for the CI failure) replaced these with minimal stub versions to make imports resolve, silently discarding weeks of tested logic: rotation correction, calibrated blur threshold, deskew, and most CNIC field extraction (name, father_name, all three dates, and address were entirely removed, leaving only cnic_number and a naive gender match).

Which module(s) does it touch?

docling_pk/preprocessor.py, docling_pk/ocr.py, docling_pk/parsers/cnic.py. Also removes docling_pk/parsers/pycache (compiled bytecode, should never be committed) and tests/test_placeholder.py (superseded by the real test files already in the repo).

How did you test it?

This is the exact code from feat/preprocessor and feat/ocr, both already tested extensively against real CNIC and certificate photos throughout the project, documented in the design doc's Technical Approach section.

Checklist:

• Restores previously tested, working code
• Removes accidentally committed build artifacts
• Lead Engineer has reviewed and approved before submitting to director (flagging for Khubaib's direct review given the urgency and evaluation timing)

[khadijja1]

remove the pycache folder to maintain a clean repository and avoid conflict. Use Git's .gitignore