graphify extract <path> --out R is documented to send all output to
R/graphify-out/, but the AST and semantic extraction caches were still
anchored at the scanned project (cache_root=target / root=target). That
re-created a graphify-out/ directory inside the project the user
explicitly asked to keep clean.
Anchor both caches at out_root instead. With --out unset, out_root
equals target, so existing in-project behavior is unchanged.
Adds test_extract_out_keeps_project_root_clean: runs extract from a
project root with --out pointing elsewhere and asserts the artifacts
land under --out while the project directory stays byte-identical.
Vlladie Condeno
7cb5e86fc1