Stable FTS-safe token for one exact vault-relative source path.
UTF-8 hex keeps every legal filename inert in MATCH expressions and is
prefix-preserving: a folder token can select descendants with FTS5's indexed
prefix operator. One token per chunk covers both exact-path and ancestor
folder lookup, avoiding repeated ancestor postings in large/deep vaults.
Stable FTS-safe token for one exact vault-relative source path.
UTF-8 hex keeps every legal filename inert in MATCH expressions and is prefix-preserving: a folder token can select descendants with FTS5's indexed prefix operator. One token per chunk covers both exact-path and ancestor folder lookup, avoiding repeated ancestor postings in large/deep vaults.