Add mod development environment, docs, and example modlet

.kilo/command/7d2d.md

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+# 7D2D Modding Commands
+
+## Game Paths
+- Steam install: `C:\Steam\steamapps\common\7 Days To Die`
+- Mod staging: `C:\7D2D`
+- Mod launcher: `C:\Program Files (x86)\7D2DModLauncherV5\ModLauncherV5.exe`
+- Mod launcher config: `C:\Users\lynda\AppData\Roaming\7D2DModLauncher\ModLauncher.txt`
+
+## Launching the Game
+1. Open `7D2DModLauncherV5` from Start Menu or run `C:\Program Files (x86)\7D2DModLauncherV5\ModLauncherV5.exe`
+2. Select desired mod/profile
+3. Click Play
+
+## Mod Development Workflow
+
+### Simple Modlets (vanilla folder)
+1. Create/update modlet files in `mods/` in this repo
+2. Run `.kilo/scripts/modlet.ps1 -Action enable` to copy modlets to the Steam `Mods` folder
+3. Launch the game and start a new save to test
+4. Run `.kilo/scripts/modlet.ps1 -Action disable` to remove modlets when done
+5. Run `.kilo/scripts/modlet.ps1 -Action sync` to update already-enabled modlets after making changes
+
+### Full Mods (mod launcher)
+1. Create/update mod files in this repo
+2. Copy or sync modified files to the mod launcher's game copy under `C:\7D2D\v3\<mod_name>\`
+3. Launch via Mod Launcher to test
+
+## Current Installed Mods
+See `ENVIRONMENT.md` for the full list of installed mods and their paths.
+
+## Notes
+- Current target version is 3.x
+- v3 mods are available in the mod launcher under `C:\7D2D\v3\`