List the contrib classes that extend, implement or use a core class, interface or trait, one row per edge with file and line, paged. Example: "who subclasses FormBase". Call-site counts: list_symbol_users. The symbol's status: lookup_core_symbol.
- target: with or without the leading backslash. An unknown target is refused with a pointer at lookup_core_symbol; a fragment there lists candidates. rel_kind: one of extends, implements, uses_trait. project: one machine name.
- Development branches only. edge_count: every edge. project_count: projects. count: edges after the per_project cap. project_edges on each row: the project's full count. per_project=50 with project= lists one project in full.
- Rows are ordered by project installs, project, source_fqn. Each row: project, branch, installs, source_fqn, rel_kind, file, line, project_edges. limit ≤ 100. next_offset is absent on the last page.
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