Review story 2.3: home marker and airspace outlines passes all ACs

All 10 review criteria pass without any code fixes required. Two tech-debt
items added to deferred-work: non-Polygon geometry types silently skipped
(intentional for MVP) and null-geometry GeoJSON features would raise
AttributeError (acceptable for controlled OpenAIP input).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

_bmad-output/implementation-artifacts/sprint-status.yaml

@@ -35,7 +35,7 @@
 # - Dev moves story to 'review', then runs code-review (fresh context, different LLM recommended)
 
 generated: 2026-04-22
-last_updated: 2026-04-22  # 2-1 done, 2-2 done, epic-2 in-progress
+last_updated: 2026-04-22  # 2-1 done, 2-2 done, 2-3 done, epic-2 in-progress
 project: planeMapper
 project_key: NOKEY
 tracking_system: file-system
@@ -55,7 +55,7 @@ development_status:
   epic-2: in-progress
   2-1-aircraft-data-model-and-fetcher: done
   2-2-coordinate-projection-and-base-map-loading: done
-  2-3-home-marker-and-airspace-outlines: review
+  2-3-home-marker-and-airspace-outlines: done
   2-4-altitude-colour-bands-and-aircraft-type-icons: backlog
   2-5-per-aircraft-drawing: backlog
   2-6-stateful-renderer-and-display-interface: backlog