Claude Code on macOS: every Bash call fails with ENOSPC when the Data volume is full

Symptom: Bash tool refuses to start commands ("disk is full (ENOSPC) on the volume holding /tmp/claude-501"); df shows /System/Volumes/Data at 100% (that volume is the normal user-data half of the APFS disk, not a separate drive). Quick safe recovery: rm -rf ~/Library/Caches/* (regenerable, ~16 GB here) and ~/.npm/_cacache (~3 GB) took free space from 0.8 GB to 21 GB. Also check lsof +L1: long-lived claude processes held ~12 GB of deleted-but-open files; that space only returns when those sessions exit. Leave Trash/Downloads to the user.