feat(runtime): Campaign CC slice CC3 — RuntimeCharacterCreationState

Ports retail's CharGenState as the one Runtime-owned character-creation
state machine, mirroring RuntimeCharacterSelectionState's exact pattern
(snapshot/delta/event-stream, borrow-only view, generation-gated
commands, one mutable owner, no App types). Every command ports a named
retail function: SetHeritageGroup, SetGender, SetTemplate/ApplyTemplate
(Custom = template 0, Olthoi force-lock), the six attribute setters plus
GetAbsRemainingCredits/BalanceAttributes (retail's literal round-robin
order and fairness cursor), SetSkillLevel plus ResetSkillLevels' free-skill
baseline (reusing CC1's ChargenSkillCreditMath two-tier cost lookup
verbatim), RandomizeStartArea, and DoFinish's complete gate sequence
(empty name / unspent attribute credits / already-Pending / client-side
roster-vs-slotCount cap).

LiveSessionController gained a sibling IRuntimeCharacterCreationCommands
implementation, a CreateCharacter wire hook, and a response handler that
reuses existing machinery rather than inventing new paths: the Ok
identity is appended to the roster via RuntimeCharacterSelectionState's
own ApplyRoster, and the "log straight in" behavior reuses the private
EnterSelectedCore. ILiveSessionLifecycleHost gained two default-no-op
hooks (ApplyCharacterCreated/ApplyCreationFailed) so AcDream.App needs
zero changes to keep compiling; wiring them to the status stream is a
CC4 follow-up.

Filed four divergence-register rows for the corners deliberately not
ported: the FPU-unrecoverable FitTemplateToCharacter auto-detect (AP-207,
ACE only reads the field for title text), the per-style color-count
approximation (AP-208, CC1's model has no per-style palette data), the
classID DAT-DID placeholder (AP-209, ACE ignores the field), and
ApplyTemplate's atomic-vs-sequential attribute apply (AP-210).

34 new tests: full state-machine coverage (every Finish gate, every
rejection-code mapping, duplicate-NameInUse tolerance, Olthoi lock,
attribute balance/lock interaction, uncostable-skill rejection) plus a
LiveSessionController integration suite proving the wire send is exactly
55 skill slots (decoded from a real WorldSession + GameMessageCapture)
and the full Ok/rejection round trip through WorldSession.ProcessDatagram.

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

src/AcDream.Runtime/GameRuntimeCommands.cs

@@ -378,6 +378,82 @@ public interface IRuntimeAllegianceCommands
         bool on);
 }
 
+// ── Character creation (Campaign CC slice CC3, 2026-08-15) ─────────────────
+
+/// <summary>
+/// Generation-gated character-creation (CharGenState) outbound actions —
+/// lands beside <see cref="IGameRuntimeCommands.CharacterSelection"/>, the
+/// same command family shape.
+/// </summary>
+public interface IRuntimeCharacterCreationCommands
+{
+    RuntimeCommandResult SelectHeritage(
+        RuntimeGenerationToken expectedGeneration,
+        uint heritageId);
+
+    RuntimeCommandResult SelectGender(
+        RuntimeGenerationToken expectedGeneration,
+        uint genderKey);
+
+    RuntimeCommandResult SelectTemplate(
+        RuntimeGenerationToken expectedGeneration,
+        uint templateIndex);
+
+    RuntimeCommandResult SetAttribute(
+        RuntimeGenerationToken expectedGeneration,
+        Session.ChargenAttributeId attributeId,
+        int value);
+
+    RuntimeCommandResult SetAttributeLock(
+        RuntimeGenerationToken expectedGeneration,
+        Session.ChargenAttributeId attributeId,
+        bool locked);
+
+    RuntimeCommandResult TrainSkill(
+        RuntimeGenerationToken expectedGeneration,
+        uint skillId);
+
+    RuntimeCommandResult SpecializeSkill(
+        RuntimeGenerationToken expectedGeneration,
+        uint skillId);
+
+    RuntimeCommandResult UntrainSkill(
+        RuntimeGenerationToken expectedGeneration,
+        uint skillId);
+
+    RuntimeCommandResult SetAppearanceIndex(
+        RuntimeGenerationToken expectedGeneration,
+        Session.ChargenAppearanceSlot slot,
+        uint index);
+
+    RuntimeCommandResult SetShade(
+        RuntimeGenerationToken expectedGeneration,
+        Session.ChargenShadeSlot slot,
+        double value);
+
+    RuntimeCommandResult SelectStartArea(
+        RuntimeGenerationToken expectedGeneration,
+        int startAreaIndex);
+
+    RuntimeCommandResult SetName(
+        RuntimeGenerationToken expectedGeneration,
+        string name);
+
+    RuntimeCommandResult SetSlot(
+        RuntimeGenerationToken expectedGeneration,
+        uint slot);
+
+    /// <summary>Retail's Finish button (<c>gmCharGenMainUI::DoFinish @
+    /// 0x004E9170</c>). On acceptance the request is already on the wire;
+    /// the Ok/rejection reply arrives asynchronously as a status delta —
+    /// see <see cref="Session.RuntimeCharacterCreationState"/>.</summary>
+    RuntimeCommandResult Finish(
+        RuntimeGenerationToken expectedGeneration);
+
+    RuntimeCommandResult AcknowledgeRejection(
+        RuntimeGenerationToken expectedGeneration);
+}
+
 public interface IGameRuntimeCommands
 {
     IRuntimeSessionCommands Session { get; }
@@ -386,6 +462,10 @@ public interface IGameRuntimeCommands
         throw new NotSupportedException(
             "This command adapter does not project character selection.");
 
+    IRuntimeCharacterCreationCommands CharacterCreation =>
+        throw new NotSupportedException(
+            "This command adapter does not project character creation.");
+
     IRuntimeSelectionCommands Selection { get; }
 
     IRuntimeCombatCommands Combat { get; }