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ddidderr 73d8afc8d3 docs: add hard Sudoku example
Transcribe the hard 9x9 Sudoku puzzle from the provided image into the
plain-text example format accepted by the solver. The new example gives users a
ready-made input file for manual CLI checks.

Document the example directory in the README project decomposition and include a
command showing how to run the solver against this puzzle.

Test Plan:
- cargo run -- sudoku-examples/hard.sudoku

Refs: none
2026-04-25 21:05:31 +02:00

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Plaintext

1 0 0 0 3 4 0 0 8
0 7 0 6 8 0 0 3 0
0 0 8 2 1 0 7 0 4
0 5 4 0 9 0 6 8 0
9 1 0 5 0 8 0 2 0
0 8 0 3 0 0 0 0 5
3 0 5 9 0 6 8 7 1
0 0 6 0 0 0 0 4 0
0 0 1 0 7 0 2 0 0