Usage
machine-memory coverage (--local|--remote)
machine-memory coverage --root cli/src (--local|--remote)coverage walks directories under the current working directory, compares
their names with tags on active memories, and returns uncovered_paths plus a
tag_distribution map. --root changes the directory tree being inspected.
The result is a signal for missing path-driven context, not a percentage. Add or update memories with scoped tags when an uncovered directory matters.