chore: initialize PDF Annotation Merge repo

.gitignore

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+# Python
+__pycache__/
+*.py[cod]
+.venv/
+venv/
+
+# Generated files
+output/
+*.log
+
+# Local/input PDFs and spreadsheets
+input/
+data/*.xlsx
+data/*.csv
+
+# OS/editor
+.DS_Store
+.vscode/
+.idea/

README.md

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+# PDF Annotation Merge
+
+Spreadsheet-driven generation of standards-compliant PDF annotations, optimized for Bluebeam review workflows.
+
+## Goal
+
+Generate review markup PDFs from structured data, including:
+- title block change notes
+- revision text notes
+- drafter find/replace notes
+- Bluebeam-friendly PDF annotations
+
+## Core idea
+
+CSV / spreadsheet rows -> PDF annotations -> reviewed/finalized in Bluebeam.

requirements.txt

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+pymupdf
+pandas
+openpyxl