Function default_spool_dir 

pub fn default_spool_dir() -> PathBuf

Resolve the directory where oracle traces are buffered before upload to remote storage.

Reads CODETETHER_ORACLE_SPOOL_DIR if set; otherwise falls back to $HOME/.codetether/traces/pending.

Examples

std::env::set_var("CODETETHER_ORACLE_SPOOL_DIR", "/tmp/spool");
assert_eq!(default_spool_dir(), PathBuf::from("/tmp/spool"));