Rename to rpmroute

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.

tests/route/test_via_spacing.py

@@ -5,8 +5,8 @@ from __future__ import annotations
 import itertools
 import math
 
-from freeroute.dsn import parse_dsn
-from freeroute.route.pipeline import route_dsn_board_exact
+from rpmroute.dsn import parse_dsn
+from rpmroute.route.pipeline import route_dsn_board_exact
 
 # four GND pads 0.5 mm apart over a GND plane: each drops a via to the plane
 _DSN = """(pcb holes (parser) (resolution um 10) (unit um)
@@ -57,9 +57,9 @@ def test_connections_sharing_a_plane_via_write_it_once():
 
 
 def _router(dsn_text, via_drill_um=300):
-    from freeroute.board import build_board
-    from freeroute.route.grid_router import GridRouter
-    from freeroute.route.pipeline import _rule_clearance_dsn, _rule_width_dsn
+    from rpmroute.board import build_board
+    from rpmroute.route.grid_router import GridRouter
+    from rpmroute.route.pipeline import _rule_clearance_dsn, _rule_width_dsn
 
     dsn = parse_dsn(dsn_text)
     s = dsn.resolution.value
@@ -90,7 +90,7 @@ def test_no_via_goes_near_a_through_hole_pads_hole_even_of_its_own_net():
 
 
 def test_a_via_in_a_pad_keeps_hole_spacing_from_a_fixed_via():
-    from freeroute.geometry import IntPoint
+    from rpmroute.geometry import IntPoint
 
     text = _THT.replace("(network (net SIG (pins J1-1))))",
                         "(network (net SIG (pins J1-1)))\n"