v4.15.0

• chore!: increase MSRV to 1.87.0 and switch to edition 2024
• fix: yen k=0 panic, and DfsReachable stack overflow
• fix: add missing link in documentation
• feat: add kuhn_munkres_complexity example to experimentally measure algorithm complexity
• feat: add floyd_partial and brent_partial cycle-finding functions
• feat: adapt BFS to accept multiple starts
• feat: add NodeRefs
• perf(idastar): use set for nodes encountered in path
• perf: pre-allocate some hash maps
• docs: add comprehensive graph documentation with examples
• docs(kruskal): use correct return type in function documentation
• chore: make some functions const
• chore(deps): update rust crate criterion to 0.8