Module completion 

Tab completion for the db-shell.

Completes:

• Command names
• Path arguments: resolves the parent directory and lists its children

Sequence numbers inside /checkpoints/seq/ are NOT completed because the integer space is too large. Digest prefixes are completed up to the 30-entry limit.

Structs

ShellHelper

Functions

is_seq_cursor_level

Parse a path string, returning None if it resolves to a sequence-number level that should not be completed (to avoid the huge integer space).