feat(mosstank): add VTank-style automation PoC

src/AcDream.App/RuntimeOptions.cs

@@ -122,6 +122,11 @@ public sealed record RuntimeOptions(
 
     public uint? PreparedAssetEffectiveRecipeVersion { get; init; }
 
+    /// <summary>Optional machine-local peer tags advertised to other plugin
+    /// instances. Parsed once here so the live automation surface never reads
+    /// process configuration directly.</summary>
+    public IReadOnlyList<string> PluginTags { get; init; } = [];
+
     /// <summary>
     /// Build options from the process environment. Used by
     /// <c>Program.cs</c> at startup.
@@ -247,7 +252,10 @@ public sealed record RuntimeOptions(
             StatusFilePath: null,
             Plugins: null,
             LoginCommands: [],
-            LoginCommandDelayMs: 500);
+            LoginCommandDelayMs: 500)
+        {
+            PluginTags = ParsePluginTags(env("ACDREAM_PLUGIN_TAGS")),
+        };
     }
 
     /// <summary>
@@ -367,6 +375,15 @@ public sealed record RuntimeOptions(
     private static string? NullIfEmpty(string? s)
         => string.IsNullOrEmpty(s) ? null : s;
 
+    private static IReadOnlyList<string> ParsePluginTags(string? value) =>
+        (value ?? string.Empty)
+            .Split(',', StringSplitOptions.RemoveEmptyEntries
+                | StringSplitOptions.TrimEntries)
+            .Where(static tag => tag.Length <= 128)
+            .Distinct(StringComparer.OrdinalIgnoreCase)
+            .Take(128)
+            .ToArray();
+
     private static int? TryParseInt(string? s)
         => int.TryParse(s, NumberStyles.Integer, CultureInfo.InvariantCulture, out var v) ? v : null;