Function max_relationships_per_memory 

pub fn max_relationships_per_memory() -> usize

Resolves the per-memory relationship cap (flag/XDG/runtime_config).

v1.0.22: makes the cap (default 50) configurable without product env. Audit found that rich documents silently hit the cap; users with dense technical corpora can raise it via XDG. Values outside [1, 10000] fall back to the default.