cbm_project_name_from_path replaced only "/" and ":" with "-", leaving
spaces, "@", "+", unicode, etc. intact. resolve_store (via project_db_path)
gates on cbm_validate_project_name, which allows only [A-Za-z0-9._-]. So a
repo like "/home/u/my project" was indexed and shown by list_projects (which
opens the .db file directly), yet index_status/search_graph reported
project-not-found because resolve_store rejected the space.
Normalize every rejected character to "-", collapse consecutive dots (the
validator forbids ".."), and strip leading dots, so a derived name always
satisfies cbm_validate_project_name and round-trips through resolve_store.