Initial commit: IRON NEST Assist

GTK4/libadwaita desktop helper for IRON NEST: Heavy Turret Simulator.
Reads clipboard screenshots of the game's typewriter orders via Tesseract
OCR, parses absolute/relative entity positions, geometrically resolves
relative bearing/distance clues into map coordinates, and provides a
firing-commands sidebar with real ballistics (elevation/azimuth/powder
charge). Screen-reading only — no game files touched, no input injected.

- models.py: Board/Nest/Spotter/ReferencePoint/Target data model
- ocr.py: Tesseract preprocessing + typewriter-text parsing
- solver.py: bearing/distance geometric resolution (4 solvable shapes)
  plus position-based dedup for generic contacts later identified more
  specifically at the same resolved coord
- ballistics.py / shells.py: elevation/azimuth/charge math, shell types
- grid_widget.py: interactive map canvas (hidden entities and,
  optionally, dead targets are excluded from the map view entirely
  unless selected)
- firing_panel.py: drag-reorderable firing-command sidebar
- app.py: main window wiring it all together

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

.gitignore

@@ -0,0 +1,4 @@
+__pycache__/
+*.pyc
+captures/*.png
+.venv/