Feat/hard errors diff preview#2

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improdead wants to merge 2 commits intomainfrom

feat/hard-errors-diff-preview

Commits on Aug 31, 2025

chore: add strict error handling (no silent fallbacks), fix Next build (config + tsconfig + root layout), and add unified diff preview; update docs
improdead
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Commits on Sep 1, 2025

Update project files and add docs directory
improdead
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