The router began as a port of FreeRouting and has grown its own engine
(negotiated congestion, tree nets, exact checks, axis escapes), and
'freeroute' was one letter from the project it no longer follows. The
package, module and command are now rpmroute; the freeroute command stays
as an alias, and the RPMROUTE / RPMROUTE_ORACLE_JAVA variables fall back
to the old FREEROUTE names. Version 2026.10.07. Routing is unchanged: a
PCBench board routes to a byte-identical session either way.
Captures the three non-negotiable invariants (DRC-clean output, exact integer
geometry, determinism), the engine matrix, the reference/ GPL rule, the JAR
oracle strategy, and the lessons that cost real debugging: KiCad's /*52 net
names, exact clearance being load-bearing, shove not being a densifier, and the
falsifiable-fixture bar for any density claim.
Force-added past the global ignore: this is a private repo and the file is
excluded from the sdist, so it never reaches PyPI.
rsp2k