v0.5.3

Fixes graphify update broken on mixed code+docs corpora (#582)

AST and semantic cache entries now live in separate cache/ast/ and cache/semantic/ subdirectories. Previously both wrote to the same flat cache/ directory — semantic results silently overwrote AST entries for code files, causing the shrink guard to fire on every subsequent graphify update run.

Existing flat cache entries are read as a migration fallback so no cache is lost on upgrade.

Upgrade: pip install --upgrade graphifyy