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_room_shove.py

@@ -32,12 +32,12 @@ import sys
 
 import pytest
 
-from freeroute.board import build_board
-from freeroute.dsn import parse_dsn
-from freeroute.dsn.sexp import parse
-from freeroute.geometry import IntBox, IntPoint, Polyline, PolylineShape
-from freeroute.route import route, route_dsn_board_exact, route_dsn_board_rooms
-from freeroute.route.pipeline import _rule_clearance_dsn
+from rpmroute.board import build_board
+from rpmroute.dsn import parse_dsn
+from rpmroute.dsn.sexp import parse
+from rpmroute.geometry import IntBox, IntPoint, Polyline, PolylineShape
+from rpmroute.route import route, route_dsn_board_exact, route_dsn_board_rooms
+from rpmroute.route.pipeline import _rule_clearance_dsn
 
 
 def _emitted_drc_violations(result, clearance):
@@ -265,8 +265,8 @@ def test_shove_is_byte_identical_on_foundation_fixtures(fixture):
 
 
 def test_project_gate_reduces_to_clamp_without_occupancy():
-    from freeroute.board.search_tree import ShapeSearchTree
-    from freeroute.route.room_router import _Door, _edge_gate, _project_gate
+    from rpmroute.board.search_tree import ShapeSearchTree
+    from rpmroute.route.room_router import _Door, _edge_gate, _project_gate
 
     door = _Door(other=1, kind="edge", lo=IntPoint(0, 100), hi=IntPoint(200, 100))
     tree = ShapeSearchTree()
@@ -277,8 +277,8 @@ def test_project_gate_reduces_to_clamp_without_occupancy():
 
 
 def test_project_gate_avoids_other_net_copper_on_the_door():
-    from freeroute.board.search_tree import ShapeSearchTree, TreeShape
-    from freeroute.route.room_router import _Door, _project_gate
+    from rpmroute.board.search_tree import ShapeSearchTree, TreeShape
+    from rpmroute.route.room_router import _Door, _project_gate
 
     door = _Door(other=1, kind="edge", lo=IntPoint(0, 100), hi=IntPoint(200, 100))
     tree = ShapeSearchTree()
@@ -293,7 +293,7 @@ def test_project_gate_avoids_other_net_copper_on_the_door():
 
 
 def test_free_intervals_splits_around_forbidden_band():
-    from freeroute.route.room_router import _best_free_point, _free_intervals
+    from rpmroute.route.room_router import _best_free_point, _free_intervals
 
     free = _free_intervals(0, 200, [(87, 113)])
     assert free == [(0, 87), (113, 200)]