Add debug output support and refactor DbGenerator CLI

- Add RecognitionOptions with DebugOutputDirectory for saving pipeline
  stages (input, detection, perspective correction, CLAHE preprocessing)
- Wire up IOptions<RecognitionOptions> via DI in MauiProgram
- Extract GenerateCommand from Program.cs using Spectre.Console.Cli
- Add priority card support with preferred set matching (Alpha/Beta)
- Expand card_hashes.db with more cards for better recognition coverage
- Update AGENTS.md with comprehensive project documentation

💘 Generated with Crush

Assisted-by: Claude Opus 4.5 via Crush <crush@charm.land>

.justfile

@@ -1,24 +1,46 @@
 # Scry development commands
+
+set shell := ["C:/Program Files/Git/usr/bin/bash.exe", "-c"]
+set unstable := true
+
 # Android SDK paths
 
-android_sdk := env_var('LOCALAPPDATA') / "Android/Sdk"
+android_sdk := replace(env('LOCALAPPDATA'), '\', '/') / "Android/Sdk"
 adb := android_sdk / "platform-tools/adb.exe"
 emulator := android_sdk / "emulator/emulator.exe"
 camera_virtual := "-camera-back virtualscene -virtualscene-poster wall=\"" + (justfile_directory() / "TestImages/reference_alpha/serra_angel.jpg") + "\""
 camera_webcam := "-camera-back webcam0 -camera-front webcam0"
 
+[private]
+@default:
+    just --list
+
+# Start emulator in background
 emu camera="virtual":
-    {{ emulator }} -avd Pixel_6 {{ if camera == "virtual" { camera_virtual } else { camera_webcam } }} -gpu host &
+    {{ emulator }} -avd Pixel_6 {{ if camera == "virtual" { camera_virtual } else { camera_webcam } }} -no-snapshot-load -gpu host
 
 # Kill the running emulator
 emu-kill:
     {{ adb }} emu kill
 
-# Wait for emulator to fully boot
+# Wait for emulator to fully boot (timeout after 2 minutes)
+[script]
 emu-wait:
-    @echo "Waiting for emulator to boot..."
-    @while [ "$({{ adb }} shell getprop sys.boot_completed 2>/dev/null)" != "1" ]; do sleep 1; done
-    @echo "Emulator ready"
+    # Wait for Android emulator to boot with timeout
+    TIMEOUT=120
+
+    echo "Waiting for emulator to boot..."
+
+    for ((i=TIMEOUT; i>0; i--)); do
+        if [ "$({{ adb }} shell getprop sys.boot_completed 2>/dev/null)" = "1" ]; then
+            echo "Emulator ready"
+            exit 0
+        fi
+        sleep 1
+    done
+
+    echo "Emulator failed to boot within 2 minutes"
+    exit 1
 
 # Build a project
 build project="src/Scry.App" target="net10.0-android":
@@ -52,11 +74,11 @@ test:
     dotnet test test/Scry.Tests
 
 # Generate the card hash database from Scryfall
-gen-db *args: (build "tools/DbGenerator" "net10.0")
+gen-db: (build "tools/DbGenerator" "net10.0")
     @echo "Running Database generator (this takes a while)..."
-    dotnet run --project tools/DbGenerator --no-build -- src/Scry.App/Resources/Raw/card_hashes.db {{ args }}
+    dotnet run --project tools/DbGenerator --no-build -- src/Scry.App/Resources/Raw/card_hashes.db
     @echo "Completed generating the database"
 
 # Full workflow: start emulator, wait, run with hot reload
-dev: emu emu-wait
+dev:
     dotnet watch --project src/Scry.App -f net10.0-android