chore: add asset-standards instructions for auto-enforcement

Auto-attaches to all Assets/_Game/** file operations.
Contains: prefix table, directory rules, Addressables group/label
mapping, required editor tools, and hard rules.
References full specs in Docs/Standards/ for detail.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.github/instructions/asset-standards.instructions.md

@@ -0,0 +1,126 @@
+---
+description: "Use when creating, moving, renaming, or placing any Unity game assets, ScriptableObjects, Prefabs, scenes, art, audio, or scripts under Assets/_Game/. Also use when writing Addressables group/label assignments or AddressKeys.cs constants. Enforces Docs/Standards/AssetFolderSpec.md and Docs/Standards/AddressablesLabelSpec.md."
+applyTo: "Assets/_Game/**"
+---
+
+# Asset Standards Enforcement
+
+Full specifications:
+- Naming, directories, Addressables: `Docs/Standards/AssetFolderSpec.md`
+- Addressable labels & groups: `Docs/Standards/AddressablesLabelSpec.md`
+
+When in doubt, **READ THE SPEC FILE** before deciding a path or name.
+
+---
+
+## Asset Naming Prefix Table
+
+| Prefix | System | Example |
+|--------|--------|---------|
+| `PLY_` | Player | `PLY_Player.prefab`, `PLY_Player01.mat` |
+| `ENM_` | Enemy | `ENM_GruntWarrior.prefab`, `ENM_E001_Stats.asset` |
+| `WPN_` | Weapon | `WPN_SkyBlade.prefab`, `WPN_SkyBlade_Data.asset` |
+| `SKL_` | Skill | `SKL_DashSlash_Data.asset` |
+| `SPL_` | Spell | `SPL_Fireball.asset` |
+| `CHM_` | Charm | `CHM_IronSkin.asset` |
+| `PROJ_` | Projectile | `PROJ_Arrow.prefab` |
+| `VFX_` | VFX | `VFX_HitSpark.prefab` |
+| `COL_` | Collectible | `COL_HPOrb.prefab` |
+| `UI_` | UI Prefab | `UI_HUD.prefab` |
+| `SYS_` | Persistent Manager | `SYS_GameManager.prefab` |
+| `ENV_` | Environment Structure | `ENV_Tilemap_Ground.prefab` |
+| `WLD_` | World Object | `WLD_Chest.prefab` |
+| `EVT_` | Event Channel SO | `EVT_PlayerDied.asset` |
+| `CMB_` | Combat SO | `CMB_DamageSource_Sword.asset` |
+| `MAP_` | Map data | `MAP_RoomData_Forest_01.asset` |
+| `AUD_BGM_` | BGM audio | `AUD_BGM_Forest.asset` |
+| `AUD_SFX_` | SFX audio | `AUD_SFX_HitImpact.asset` |
+| `ABL_` | Ability | `ABL_DoubleJump.asset` |
+| `SET_` | Settings | `SET_GlobalSettings.asset` |
+
+---
+
+## Key Directory Rules
+
+| Asset Type | Must Go In |
+|-----------|-----------|
+| Sprite / Texture | `_Game/Art/Characters/…`, `_Game/Art/Effects/…`, `_Game/Art/UI/…` |
+| AnimationClip / Controller | Same `…/{ID}/Animations/` folder as sprites |
+| Material `.mat` | Same `…/{ID}/Materials/` folder as sprites |
+| Sprite Atlas | `…/{ID}/Atlases/` subfolder beside its sprites |
+| ScriptableObject `.asset` | `_Game/Data/{module}/` (never inside `Prefabs/` or `Art/`) |
+| Event Channel SO | `_Game/Data/Events/{module}/` |
+| Prefab (player/enemy/vfx/etc.) | `_Game/Prefabs/{category}/` |
+| Scene | `_Game/Scenes/` (test scenes → `Scenes/Testings/`) |
+| Shader Graph | `_Game/Shaders/BaseASE/{category}/` |
+| HLSL include | `_Game/Shaders/Includes/` |
+| UXML / USS | `_Game/UI Toolkit/Layouts/` or `Styles/` |
+| Skill SO | `_Game/Data/Progression/Skills/` |
+| Weapon SO | `_Game/Data/Combat/Weapons/` |
+| Charm SO | `_Game/Data/Progression/Charms/` |
+| Config SO (dynamic) | `_Game/Data/Settings/` or `_Game/Data/{module}/` |
+
+---
+
+## Addressables Group Assignment
+
+| Address Prefix | Group |
+|---------------|-------|
+| `Scene_` | `Scenes` |
+| `PLY_`, `WPN_` | `Player` |
+| `ENM_` | `Enemies` |
+| `PROJ_` | `Projectiles` |
+| `VFX_` | `VFX_Common` |
+| `UI_` | `UI` |
+| `COL_` | `Collectibles` |
+| `CHM_`, `Config/` | `Config` |
+| `AUD_` | `Audio_Music` |
+| `Room_{Region}_*` | `Room_{Region}` (dynamic) |
+| `Boss_{Name}` | `Boss_{Name}` (dynamic) |
+
+## Addressables Label Assignment
+
+| Address Prefix | Labels |
+|---------------|--------|
+| `PLY_` | `Preload` |
+| `WPN_` | `Weapon`, `Preload` |
+| `ENM_` | `Enemy` |
+| `PROJ_` | `Poolable`, `Preload` |
+| `VFX_` | `Poolable`, `Preload` |
+| `COL_` | `Poolable`, `Preload` |
+| `CHM_` | `Charms` |
+| `Config/` | `Config` |
+| `AUD_BGM_` | `BGM` |
+| `AUD_SFX_` | `SFX` |
+| `Scene_MainMenu` | `Preload` (exact override) |
+| `UI_FloatingDamageText` | `Poolable`, `Preload` (exact override) |
+
+---
+
+## Required: Use Editor Tools
+
+Never create assets manually in Project window. Always use the editor tools:
+
+| Asset to Create | Tool | Menu Path |
+|----------------|------|-----------|
+| Enemy SO | Enemy Data Manager | `BaseGames/Data/Enemy Data Manager` |
+| Weapon SO | Weapon Editor | `BaseGames/Data/Weapon Editor` |
+| Weapon HitBox Prefab | Weapon HitBox Wizard | `BaseGames/Create/Weapon HitBox Prefab` |
+| Skill SO | Skill Editor | `BaseGames/Data/Skill Editor` |
+| Skill HitBox Prefab | Skill HitBox Wizard | `BaseGames/Create/Skill HitBox Prefab` |
+| Player Form SO | Character Wizard | `BaseGames/Data/Character Wizard` |
+| Boss skill data | Boss Skill Sequence | `BaseGames/Data/Boss Skill Sequence` |
+| Addressables group/label sync | Rule Sync | `BaseGames/Addressables/Rule Sync` |
+| Addressables batch register | Addressable Batch Tool | `BaseGames/Addressables/Addressable Batch Tool` |
+| Validate address keys | Validate Address Keys | `BaseGames/Addressables/Validate Address Keys` |
+
+---
+
+## Hard Rules
+
+- All `Address` constants → `AddressKeys.cs`. Never hardcode strings in code.
+- All asset loading → `AssetLoader.LoadAsync<T>(AddressKeys.Xxx)`. Never call `Addressables.LoadAssetAsync` or `Resources.Load` directly.
+- `EVT_*.asset` event channels are **never** registered as Addressables (use Inspector references).
+- Sub-Prefabs (HitBox, HurtBox, bones) are **never** registered as Addressables.
+- Test scenes in `Scenes/Testings/` are **never** registered as Addressables.
+- All first-party assets must be under `Assets/_Game/`. Never place custom assets in third-party plugin folders.