v0.9.59

• Fix: an incremental rebuild no longer drops cross-file concept nodes from files it didn't touch — global dedup during a merge now protects existing nodes from untouched files instead of collapsing same-labeled ones across them (#3477, thanks @hopstreax).
• Fix: extraction now falls back to sequential in-process work when the process pool cannot start (e.g. POSIX semaphore exhaustion), instead of aborting the whole run (#3497, thanks @curtismu7).
• Performance: Python symbol resolution is roughly 47% faster — path resolution is memoized, each file parses once across both resolution passes, and the tree walk is iterative rather than recursive; extraction output is unchanged (#3500 / #3501 / #3502, thanks @abhay-codes07).
• Fix: graphify explain now accepts a path::Symbol form to disambiguate a symbol that shares its name with its file, and the ambiguity hint now shows a form the resolver actually accepts (#3485, thanks @ayushcodes10).
• Fix: the git hook now keeps its rebuild root inside the repository — a committed .graphify_root pointing outside the worktree is ignored and falls back to the repo top, so a checked-in marker can't steer the hook to scan or write outside the tree (#3265, thanks @ayushcodes10).