A unit call-sign is not a place

"Post 1-2" reached the geocoder, resolved against its talkgroup anchor and
produced a confident pin in the right town for an event with no known
location — while sitting in the same incident's `units` list the whole time.
A plausible wrong pin is worse than no pin: nothing downstream can tell it
is wrong.

Extraction returns `location` and `units` from one pass, so a string in both
is a misclassification, not two facts. Drop it before the geocoder sees it.

Closes server-26#52.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

drb-c2-core/app/internal/intelligence.py

@@ -19,7 +19,7 @@ from app.internal import area_context
 # Location validity is defined once, by the module that owns the incident's
 # location/pin invariant.  incident_correlator does not import this module, so
 # this is not a cycle.
-from app.internal.incident_correlator import clean_location
+from app.internal.incident_correlator import clean_location, location_is_unit
 
 _PROMPT_TEMPLATE = """You are analyzing a P25 public safety radio recording. The audio was transcribed by Whisper through a digital radio vocoder, which introduces errors. Each numbered transmission is a separate PTT press from a different radio.
 
@@ -252,6 +252,18 @@ async def extract_scenes(
         location:           Optional[str]  = clean_location(scene.get("location"))
         vehicles:           list[str]      = scene.get("vehicles") or []
         units:              list[str]      = scene.get("units") or []
+        # A "location" that is also one of this scene's own units is a unit
+        # call-sign, not a place. Both lists come from the same extraction pass,
+        # so the disagreement is free to detect and the string must be dropped
+        # before it reaches the geocoder — anchored place verification will
+        # otherwise resolve "Post 1-2" to a confident, plausible, wrong pin in
+        # the right town. See server-26#52.
+        if location and location_is_unit(location, units):
+            logger.info(
+                f"Intelligence: dropping location {location!r} — it is one of "
+                f"this scene's units, not a place"
+            )
+            location = None
         cleared_units:      list[str]      = scene.get("cleared_units") or []
         # Every call carries a severity — it is the signal the correlator uses to
         # decide whether a call is incident-worthy at all, so it must never be