Update netwalk and puzzle render polish for volume 1

[FelineStateMachine]

Summary

• expand netwalk with gameplay, export, print, help, and visual fixture coverage
• polish puzzle rendering and fixture outputs across multiple games, including clearer conflict and clue states
• update PDF export, registry wiring, CLI test support, and release assets for volume 1 generation
• refresh related docs, test data, and generated out/parts artifacts

Testing

• just fmt
• just lint
• just test-short