feat(chat): #20 CombatChatTranslator - retail-faithful combat -> ChatLog templates

Subscribes to CombatState's DamageDealtAccepted / DamageTaken /
MissedOutgoing / EvadedIncoming / AttackDone / KillLanded events
and emits chat-line text into ChatLog.OnCombatLine, mirroring
holtburger's templates verbatim from references/holtburger/apps/
holtburger-cli/src/pages/game/panels/chat.rs:221-308.

Pieces:
- ChatLog: new ChatKind.Combat value; new CombatLineKind enum
  (Info / Warning / Error) on ChatEntry; OnCombatLine(text, kind)
  adapter.
- CombatChatTranslator (Core, IDisposable). Static formatters:
  FormatDamageType (slashing/piercing/bludgeoning/fire/cold/acid/
  electric/nether), FormatDamageLocation (head/chest/abdomen/
  upper arm/lower arm/hand/upper leg/lower leg/foot), FormatPercent,
  FormatAttackConditionsSuffix.
- ChatVM.RecentLinesDetailed() returns FormattedLine records with
  kind metadata so panels can render combat lines colored.
- ChatPanel switches on Kind/CombatKind: combat-Info -> yellow,
  combat-Warning -> red incoming-damage, combat-Error -> deep red,
  all others -> existing renderer.Text path.
- GameWindow constructs translator after GameEventWiring.WireAll;
  disposes in OnClosing + live-session failure path.

Templates landed:
  Attacker:  "You hit {def} for {dmg} {dtype} damage ({hp%}). [Crit]{suffix}"
  Defender:  "{atk} hit you for {dmg} {dtype} damage to your {loc} ({hp%})..."
  Evade-out: "{def} evaded your attack."
  Evade-in:  "You evaded {atk}'s attack."
  AttackErr: "Attack sequence finished with {error}."
  Kill:      synthesized "You killed {name}." + server PlayerKilled
             death-message arrives separately via ChatLog.OnPlayerKilled.

Deviations from holtburger templates (documented in source):
- DamageDealt omits Critical-hit suffix until CombatState.DamageDealt
  carries the flag (defender-side has it; attacker-side doesn't yet).
- DamageTaken omits (health%) until CombatState.DamageIncoming
  parses the wire health-percent field.
- AttackConditions suffix is implemented but always empty until the
  bitflag is plumbed into CombatState records.

18 new tests (12 translator + 4 ChatVMCombat + 2 ChatLog).
Solution total: 978 green (243 Core.Net + 639 Core + 96 UI).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/AcDream.Core.Tests/Chat/ChatLogTests.cs

@@ -1,4 +1,5 @@
 using AcDream.Core.Chat;
+using AcDream.Core.Combat;
 using Xunit;
 
 namespace AcDream.Core.Tests.Chat;
@@ -172,4 +173,30 @@ public sealed class ChatLogTests
         log.OnLocalSpeech(sender: "Alice", text: "hi", senderGuid: 0xAA, isRanged: false);
         Assert.Equal("Alice", log.Snapshot()[0].Sender);
     }
+
+    // ── Phase I.7: combat-line adapter ────────────────────────────────────
+
+    [Fact]
+    public void OnCombatLine_DefaultsInfoKind_TagsEntryAsCombat()
+    {
+        var log = new ChatLog();
+        log.OnCombatLine("You hit Mosswart for 5 slashing damage (50.0%).");
+        var e = log.Snapshot()[0];
+        Assert.Equal(ChatKind.Combat, e.Kind);
+        Assert.Equal(CombatLineKind.Info, e.CombatKind);
+        Assert.Equal("You hit Mosswart for 5 slashing damage (50.0%).", e.Text);
+    }
+
+    [Fact]
+    public void OnCombatLine_PreservesExplicitKind()
+    {
+        var log = new ChatLog();
+        log.OnCombatLine("Mosswart hit you for 8 fire damage to your chest.",
+            CombatLineKind.Warning);
+        Assert.Equal(CombatLineKind.Warning, log.Snapshot()[0].CombatKind);
+
+        log.OnCombatLine("Attack sequence finished with WeenieError 0x1234.",
+            CombatLineKind.Error);
+        Assert.Equal(CombatLineKind.Error, log.Snapshot()[1].CombatKind);
+    }
 }