Release R3: fix DP-LZ names, icons, add build

Prepare R3 (June 2026) release: bulk-rename Numbered DP LZ assets to Numbered DP-LZ, correct iconset entries so Drop Point/Heli Spot icons include .png (fixes generic a-u-G rendering in strict TAK clients), add build.py, and update docs. CHANGELOG, README, CONTRIBUTING, and NWCG_Icon_Reference.html updated for TAK Aware / CloudTAK packaging and compatibility notes. .claude settings gained zip inspection commands for debugging packaged outputs.

Author: mighkel

.claude/settings.local.json

@@ -4,7 +4,9 @@
       "Bash(gh --version)",
       "Bash(zip -r ../NWCG-GeoOps2026-R2.zip . --exclude \"*/NWCG-GeoOps_ATAK-Export/*\")",
       "Read(//c/Users/PNADMIN/Documents/GitHub/**)",
-      "Bash(powershell.exe -Command \"Compress-Archive -Path ''C:\\\\Users\\\\PNADMIN\\\\Documents\\\\GitHub\\\\TAK-ICONS\\\\NWCG\\\\*'' -DestinationPath ''C:\\\\Users\\\\PNADMIN\\\\Documents\\\\GitHub\\\\TAK-ICONS\\\\NWCG-GeoOps2026-R2.zip'' -Force\")"
+      "Bash(powershell.exe -Command \"Compress-Archive -Path ''C:\\\\Users\\\\PNADMIN\\\\Documents\\\\GitHub\\\\TAK-ICONS\\\\NWCG\\\\*'' -DestinationPath ''C:\\\\Users\\\\PNADMIN\\\\Documents\\\\GitHub\\\\TAK-ICONS\\\\NWCG-GeoOps2026-R2.zip'' -Force\")",
+      "Bash(python -c \"import zipfile; z=zipfile.ZipFile\\('NWCG-GeoOps2026-R2.zip'\\); [print\\(n\\) for n in z.namelist\\(\\)[:30]]\")",
+      "Bash(python -c \"import zipfile; z=zipfile.ZipFile\\('NWCG-GeoOps2026-R2.zip'\\); names=z.namelist\\(\\); print\\(f'Total entries: {len\\(names\\)}'\\); manifest=[n for n in names if 'manifest' in n.lower\\(\\) or 'MANIFEST' in n]; print\\('Manifest files:', manifest\\); xml=[n for n in names if n.endswith\\('.xml'\\)]; print\\('XML files:', xml\\)\")"
     ]
   }
 }