correlator: a radio code is not a location

A 09-22 replay stop was titled "Traffic Stop at 96 times 5" — a disposition
code read aloud, extracted as the location (server-26#170). clean_location
now rejects "N times N", ten-codes, "signal N", "code N", "condition N".

c2-core: 476 pass.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

drb-c2-core/tests/test_clearance_tracking.py

@@ -154,3 +154,10 @@ def test_plate_read_on_a_patrol_channel_is_a_stop():
     # not on rail/bridge channels, and not without digits
     assert b("Frank David Boy 4514", [], None, "routine", "MTA Bridges and Tunnels - Whitestone") == ([], None, "routine")
     assert b("Charlie, David, go ahead.", [], None, "routine", ch) == ([], None, "routine")
+
+
+def test_radio_codes_are_not_locations():
+    for junk in ("96 times 5", "96 x 1", "10-8", "Signal 99", "code 4"):
+        assert ic.clean_location(junk) is None, junk
+    for place in ("West Main Street", "Route 9", "96 Main Street", "Exit 17 southbound"):
+        assert ic.clean_location(place) == place, place