docs: add solver visual guide

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Add a seven-page visual PDF that explains how the Sudoku solver parses input,
builds row/column/block constraints, stores candidates as bit masks, applies
naked and hidden singles, and orders recursive search branches.

The guide is authored as plain HTML/CSS/SVG so the diagrams stay reviewable and
can be regenerated without a separate design tool. The README now links to the
PDF artifact for quick discovery.

Test Plan:
- cargo test
- pdfinfo docs/solver-visual-guide.pdf
- Raster-inspected exported PDF pages with pdftoppm

Refs: none

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ddidderr

2026-04-25 21:32:14 +02:00

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docs/solver-visual-guide.pdf

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