Polishes

Assets/_Project/Scripts/Simulation/World/RunParticipant.cs

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+using Unity.Entities;
+
+namespace ProjectM.Simulation
+{
+    /// <summary>
+    /// SERVER-ONLY roster tag for the players conscripted into the CURRENT run — stamped on every connected
+    /// player at the launch edge (Launching → room 0), removed on the Returning edge. Room advances teleport
+    /// ONLY participants: a dead-respawned member (back at base) is re-conscripted on the next advance (the
+    /// operator-locked default), while a mid-run late JOINER — who never readied — stays safely at base until
+    /// the next Staging (spec §2.2 closed-party rule; post-impl review, confirmed medium). NOT a [GhostField];
+    /// disconnect cleanup is free (the tag dies with the player ghost's LinkedEntityGroup despawn).
+    /// </summary>
+    public struct RunParticipant : IComponentData
+    {
+    }
+}

Assets/_Project/Scripts/Simulation/World/RunParticipant.cs.meta

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+fileFormatVersion: 2
+guid: 92795e88279d04e42af70f8ec1032cc7