Adds a new `basic-memory orphans` CLI command that identifies entities
with no incoming or outgoing connections in the knowledge graph, helping
users discover isolated notes that haven't been linked into their knowledge base.
Changes:
- EntityRepository.find_without_relations(): efficient SQL EXISTS subquery
- GET /v2/projects/{id}/knowledge/orphans API endpoint
- OrphanEntitiesResponse schema (entities list + total count)
- KnowledgeClient.get_orphans() typed API client method
- `basic-memory orphans` CLI command with table and --json output
- Tests for repository method, API endpoint, and CLI command
Closes#762
Co-authored-by: Paul Hernandez <phernandez@users.noreply.github.com>
Signed-off-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
claude[bot]