docs: Campaign LA — pinned launch-contract schema COMMITTED into plan LA1

The LA3 Opus review process note was right: the contract both sides
implement lived only in orchestrator prompts, which is exactly the drift
mode the pin exists to prevent (and it produced the paths-key CRITICAL).
The schema, field rules, probe-mode discriminator, and status vocabulary
are now a binding plan section; amendments change this text first,
implementations second. Ledger: LA3 fix round dispatched.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/AcDream.Runtime/Session/LiveSessionController.cs

@@ -50,6 +50,32 @@ public sealed record LiveSessionStartResult(
     LiveSessionCharacterSelection? Selection = null,
     Exception? Error = null);
 
+/// <summary>
+/// Campaign LA slice LA1: one roster entry as reported by
+/// <see cref="CharacterList.Parsed"/> — decoupled from the wire type so the
+/// lifecycle-host seam does not leak <c>AcDream.Core.Net.Messages</c> shapes
+/// into every consumer.
+/// </summary>
+public readonly record struct LiveSessionRosterEntry(
+    uint Id,
+    string Name,
+    uint SecondsGreyedOut);
+
+/// <summary>
+/// Campaign LA slice LA1: the account's active-character roster, reported to
+/// <see cref="ILiveSessionLifecycleHost.ReportRoster"/> right after
+/// <c>CharacterList</c> arrives and BEFORE selection — see
+/// <c>docs/plans/2026-08-14-launcher-campaign.md</c> LA1 item 2. Hosts forward
+/// this to their status stream (<c>characterList</c> event) and, later
+/// (LA7/LA8), to the character-select screen. Deleted characters are
+/// deliberately excluded — the same candidate set
+/// <see cref="CharacterList.TrySelectFirstAvailable"/> already uses.
+/// </summary>
+public sealed record LiveSessionRosterReport(
+    string AccountName,
+    int SlotCount,
+    IReadOnlyList<LiveSessionRosterEntry> Entries);
+
 /// <summary>
 /// Runtime boundary for the domain and presentation sinks attached to one
 /// exact <see cref="WorldSession"/> generation. The controller owns the
@@ -61,6 +87,10 @@ public interface ILiveSessionLifecycleHost
     void ResetSessionState(RuntimeGenerationToken retiringGeneration);
     void ReportConnecting(string host, int port, string user);
     void ReportConnected();
+    /// <summary>Campaign LA slice LA1: reported once per successful
+    /// <c>CharacterList</c> receipt, right before character selection. See
+    /// <see cref="LiveSessionRosterReport"/>.</summary>
+    void ReportRoster(LiveSessionRosterReport roster);
     void ApplySelectedCharacter(LiveSessionCharacterSelection selection);
     void ApplyEnteredWorld(LiveSessionCharacterSelection selection);
     void DetachSession(WorldSession session);
@@ -610,6 +640,13 @@ public sealed class LiveSessionController
                 return new LiveSessionStartResult(LiveSessionStartStatus.Deferred);
 
             CharacterList.Parsed? characters = _operations.GetCharacters(session);
+            if (characters is not null)
+            {
+                host.ReportRoster(BuildRosterReport(characters));
+                if (!IsCurrent(scope, generation))
+                    return new LiveSessionStartResult(LiveSessionStartStatus.Deferred);
+            }
+
             if (characters is null
                 || !TrySelectCharacter(
                     characters,
@@ -838,6 +875,29 @@ public sealed class LiveSessionController
     private LiveSessionStartResult ConnectedResult()
         => new(LiveSessionStartStatus.Connected, _activeSelection);
 
+    /// <summary>Campaign LA slice LA1: projects the wire-shaped
+    /// <see cref="CharacterList.Parsed"/> into the decoupled
+    /// <see cref="LiveSessionRosterReport"/>. Deleted characters are
+    /// excluded, matching <see cref="CharacterList.TrySelectFirstAvailable"/>'s
+    /// candidate set.</summary>
+    private static LiveSessionRosterReport BuildRosterReport(
+        CharacterList.Parsed characters)
+    {
+        var entries = new LiveSessionRosterEntry[characters.Characters.Count];
+        for (int i = 0; i < entries.Length; i++)
+        {
+            CharacterList.Character character = characters.Characters[i];
+            entries[i] = new LiveSessionRosterEntry(
+                character.Id,
+                character.Name,
+                character.SecondsGreyedOut);
+        }
+        return new LiveSessionRosterReport(
+            characters.AccountName,
+            characters.SlotCount,
+            entries);
+    }
+
     private static bool TrySelectCharacter(
         CharacterList.Parsed characters,
         LiveSessionCharacterSelector? selector,