| Blast radius | Upstream call-graph impact of changing a symbol (callers, score, impact zone). |
| Community | Densely connected cluster from label propagation; named via communities / GQL :Community. |
| CPG | Code Property Graph — hybrid of L_repo (CALL/type) and L_proc (CFG/PDG). CLI: cpg. |
| CFG | Control-flow graph of a function (basic blocks and branches). |
| Discover | Index a repository into .rgbuilder/ (graph snapshot + analytics). |
| Fusion | Late re-ranking of semantic hits with graph signals (blast, PageRank, sketches). |
| GQL | rgBuilder graph query language (MATCH / macros) over the knowledge graph. |
| Hamming distance | Bitwise distance used for packed semantic embedding retrieval. |
| Harmonic centrality | Reachability closeness metric; opt-in via --with-harmonic for migration ranking. |
| L_proc | Per-function procedural layer (CFG/PDG archive under .rgbuilder/analysis/). |
| L_repo | Repository-level topology (functions, CALL, types) in the graph snapshot. |
| Louvain (field name) | Historical name for community id (louvain_community_id); algorithm is label propagation. |
| MRL | Multi-representation learning ideas behind fused semantic ranking (see design docs). |
| PDG | Program dependence graph — data and control deps between statements. |
| Schema version | Integer on -f json payloads; bump means breaking field changes. |
| Semantic index | Opt-in function embedding store (.rgbuilder/semantic_index.bin). |
| Slice | Statements that affect / are affected by a line+variable (or taint trace). |
| Tier 1 | Nine always-linked languages: Rust, Python, JS, TS, Go, Java, C#, C, C++. |