Merge upstream main into feat/tools-area-breakdowns

Move the changelog entry into changelog.d/1056-area-tool-breakdowns.md
(upstream's one-file-per-PR rule, #787) and leave CHANGELOG.md as on main.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

CHANGELOG.md

@@ -1,10 +1,5 @@
 # Changelog
 
-- `aircraft_in_area` and `vessels_in_area` take `group_by` and `stats`, so an
-  MCP client can ask which countries, aircraft types or ship types dominate an
-  area, or the average altitude or speed, over every match instead of
-  estimating from the returned rows. Operator and type are counted only where
-  the feed reports them.
 - Local FM seek finds stations after wrapping around 87.5–108 MHz, covers both
   band edges, skips the starting station and rejects spectra from an earlier
   tune (Aditya, @Rohilalala, #1174).

changelog.d/1056-area-tool-breakdowns.md

@@ -0,0 +1,6 @@
+- `aircraft_in_area` and `vessels_in_area` take `group_by` and `stats`, so an
+  MCP client can ask which countries, aircraft types or ship types dominate an
+  area, or the average altitude or speed, over every match instead of
+  estimating from the returned rows. Operator and type are counted only where
+  the feed reports them; AIS ship type 0 ("not available") counts as unknown
+  (quanticsoul4772, #1056).