Adding big batch of structural code provided by Claude to start designing levels

Assets/_Project/Scripts/Core/Enums.cs

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+namespace TD.Core
+{
+    /// <summary>
+    /// Identifies a player slot in a match. Backed by byte to keep grid arrays compact.
+    /// </summary>
+    /// <remarks>
+    /// <c>None</c> is a sentinel value used in <c>OwnerGrid</c> to mark tiles not owned by any player zone.
+    /// Player1..Player9 cover the maximum supported player count. Maps using fewer players use a
+    /// contiguous prefix (e.g., a 3-player map uses Player1, Player2, Player3 only).
+    /// </remarks>
+    public enum PlayerSlot : byte
+    {
+        None = 0,
+        Player1 = 1,
+        Player2 = 2,
+        Player3 = 3,
+        Player4 = 4,
+        Player5 = 5,
+        Player6 = 6,
+        Player7 = 7,
+        Player8 = 8,
+        Player9 = 9,
+    }
+
+    /// <summary>
+    /// Whether a volume permits tower placement on the tiles it covers.
+    /// </summary>
+    /// <remarks>
+    /// Defaults: <c>Allowed</c> for <see cref="TD.Levels.PlayerZoneVolume"/>, <c>Invalid</c> for
+    /// <see cref="TD.Levels.SpawnerVolume"/>, <see cref="TD.Levels.LeakExitVolume"/>, and
+    /// <see cref="TD.Levels.GoalVolume"/>.
+    /// Composition rule when volumes overlap: "Invalid wins" — any tile covered by an Invalid volume
+    /// becomes <see cref="PlacementState.Restricted"/> regardless of other volumes covering it.
+    /// </remarks>
+    public enum PlacementValidity
+    {
+        Invalid = 0,
+        Allowed = 1,
+    }
+
+    /// <summary>
+    /// Cardinal direction for spawner facing. Used by gizmos (direction arrow) and may be used
+    /// at runtime to bias initial enemy movement direction out of a spawner.
+    /// </summary>
+    public enum Direction
+    {
+        North,
+        South,
+        East,
+        West,
+    }
+
+    /// <summary>
+    /// Per-tile placement state in the baked <c>PlacementGrid</c>.
+    /// </summary>
+    /// <remarks>
+    /// Backed by byte so default-initialized arrays (all zero) start as <c>Outside</c>, which is
+    /// the correct default for any tile not covered by an authoring volume.
+    /// </remarks>
+    public enum PlacementState : byte
+    {
+        /// <summary>Tile is not covered by any authoring volume. Towers cannot be placed.</summary>
+        Outside = 0,
+
+        /// <summary>Tile is inside a player zone and not covered by any Invalid-validity volume.
+        /// Towers can be placed here (subject to runtime checks: ownership, footprint, gold, path).</summary>
+        Buildable = 1,
+
+        /// <summary>Tile is covered by at least one Invalid-validity volume (spawner, leak exit, goal).
+        /// Towers cannot be placed here. Note: this affects placement only; pathfinding still treats
+        /// the tile as walkable.</summary>
+        Restricted = 2,
+    }
+
+    /// <summary>
+    /// Outcome of a bake operation, recorded on the baked <see cref="TD.Levels.LevelData"/> asset.
+    /// </summary>
+    /// <remarks>
+    /// Failure is not represented here because failed bakes do not persist any state to the asset —
+    /// the previous successful bake (if any) remains on disk untouched. Failure state lives in
+    /// editor-only memory and is not part of the data schema.
+    /// </remarks>
+    public enum BakeOutcome
+    {
+        Success,
+        SuccessWithWarnings,
+    }
+}

Assets/_Project/Scripts/Core/Enums.cs.meta

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Assets/_Project/Scripts/Core/PlayerColors.cs

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+using UnityEngine;
+
+namespace TD.Core
+{
+    /// <summary>
+    /// Canonical color palette for player slots, used by editor gizmos to color volumes by owner.
+    /// </summary>
+    /// <remarks>
+    /// Color names follow the 9-player map design doc (red, green, blue, purple, yellow, gray,
+    /// teal, olive, dark gray). The exact RGB values have been tuned for readability when drawn
+    /// as translucent gizmos against Unity's default scene-view background. Tweak the constants
+    /// below if any color reads poorly in practice.
+    ///
+    /// The "ErrorPink" color is reserved for diagnostic use: if a volume's owner is
+    /// <see cref="PlayerSlot.None"/> (which should never happen on a valid volume), the gizmo
+    /// renders in error pink to make the bug obvious.
+    /// </remarks>
+    public static class PlayerColors
+    {
+        // Player colors. Hex values are RGB; alpha is set per-gizmo at draw time.
+        // Values are tuned to be saturated enough to read against Unity's default scene background.
+        private static readonly Color Player1Red       = HexRGB(0xE0, 0x3A, 0x3A);   // red
+        private static readonly Color Player2Green     = HexRGB(0x3A, 0xC0, 0x4A);   // green
+        private static readonly Color Player3Blue      = HexRGB(0x3A, 0x7A, 0xE0);   // blue
+        private static readonly Color Player4Purple    = HexRGB(0xA0, 0x4A, 0xC0);   // purple
+        private static readonly Color Player5Yellow    = HexRGB(0xE0, 0xC8, 0x3A);   // yellow
+        private static readonly Color Player6Gray      = HexRGB(0xB0, 0xB0, 0xB8);   // gray (slightly cool)
+        private static readonly Color Player7Teal      = HexRGB(0x3A, 0xC0, 0xB8);   // teal
+        private static readonly Color Player8Olive     = HexRGB(0x9A, 0x9A, 0x3A);   // olive
+        private static readonly Color Player9DarkGray  = HexRGB(0x60, 0x60, 0x68);   // dark gray (slightly cool)
+
+        // Non-player colors.
+        private static readonly Color GoalGold         = HexRGB(0xE0, 0xB0, 0x20);   // gold
+        private static readonly Color ErrorPink        = HexRGB(0xFF, 0x4A, 0xC8);   // diagnostic
+
+        /// <summary>
+        /// Returns the canonical color for a player slot. Returns the diagnostic error pink if
+        /// <paramref name="slot"/> is <see cref="PlayerSlot.None"/> or out of range.
+        /// </summary>
+        /// <param name="slot">The player slot to look up.</param>
+        public static Color Get(PlayerSlot slot)
+        {
+            switch (slot)
+            {
+                case PlayerSlot.Player1: return Player1Red;
+                case PlayerSlot.Player2: return Player2Green;
+                case PlayerSlot.Player3: return Player3Blue;
+                case PlayerSlot.Player4: return Player4Purple;
+                case PlayerSlot.Player5: return Player5Yellow;
+                case PlayerSlot.Player6: return Player6Gray;
+                case PlayerSlot.Player7: return Player7Teal;
+                case PlayerSlot.Player8: return Player8Olive;
+                case PlayerSlot.Player9: return Player9DarkGray;
+                case PlayerSlot.None:
+                default:
+                    return ErrorPink;
+            }
+        }
+
+        /// <summary>The canonical color used for goal volumes. Not tied to any player.</summary>
+        public static Color Goal => GoalGold;
+
+        /// <summary>Diagnostic color used when a volume has an invalid/missing owner.</summary>
+        public static Color Error => ErrorPink;
+
+        /// <summary>
+        /// Returns a copy of <paramref name="color"/> with its alpha channel replaced by
+        /// <paramref name="alpha"/>. Convenience for translucent gizmo fills.
+        /// </summary>
+        public static Color WithAlpha(Color color, float alpha)
+        {
+            color.a = alpha;
+            return color;
+        }
+
+        // Helper: build a Color from 0-255 RGB byte channels (alpha defaults to 1.0).
+        private static Color HexRGB(byte r, byte g, byte b)
+        {
+            return new Color(r / 255f, g / 255f, b / 255f, 1f);
+        }
+    }
+}

Assets/_Project/Scripts/Core/PlayerColors.cs.meta

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Assets/_Project/Scripts/Editor.meta

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Assets/_Project/Scripts/Editor/Levels.meta

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