3-Track Book Codex & Fred W. Seelig Archive Serialization

Upgraded geometor.fundamentals to match the architectural, symbolic, and visual standard of geometor/euclid, geometor/elements, and geometor/etc:

• Archival Migration: Migrated all 55 topic folders (353 scanned manuscript pages) from the legacy Grav pages/ directory into resources/seelig/<NN_slug>/ with 4-digit folio identifiers (0001.jpg–0353.jpg), diplomatic <NNNN>.rst transcriptions, <NNNN>.notes.rst editorial apparatus, and folio_reviews.json.

• Spreadsheet Extraction: Migrated Triangles and Circles.ods (59 worksheets), circumcircle-circumcenter.ods, and triangle-basics-draw.ods into resources/spreadsheets/ and parsed all formulas into resources/spreadsheets/worksheets.json and Spreadsheets.

• 3-Track Book Codex: Compiled F.1 through F.55 in docsrc/topics/ with Synthesis (index.rst), Folios (folios.rst), and Code (code.rst + model.py + interactive f-NN.svg).

• Scholarly Apparatus: Added resources/glossary.json, resources/persons.json, and resources/citations.json along with docsrc/glossary.rst, docsrc/persons.rst, and docsrc/bibliography.rst.