feat(player): #5 LocalPlayerState — Stam/Mana wired through PlayerDescription

Closes ISSUES.md #5. The Vitals devtools window now draws three bars
(HP / Stamina / Mana) once the server sends the first PlayerDescription
(0x0013), instead of HP only. Built test-first per CLAUDE.md TDD rule —
16 new tests went red before the implementation went in.

New AcDream.Core.Player.LocalPlayerState (cache):
  - {CurrentStamina, MaxStamina, CurrentMana, MaxMana} as uint? — null
    until first received.
  - StaminaPercent / ManaPercent: 0..1 fraction or null when either
    field is missing or max is zero. Clamps to 1.0 if current > max
    (server can briefly report this during buff transitions).
  - OnPlayerDescription preserves any previously known good value when
    an incoming field is null — partial profiles don't wipe state.
  - Changed event for future subscribers.

GameEventWiring.WireAll:
  - New optional 6th parameter: LocalPlayerState? localPlayer = null.
    Existing 5-arg call sites still work; without the parameter the new
    PlayerDescription handler still parses + feeds the spellbook but
    skips the cache update.
  - PlayerDescription (0x0013) shares AppraiseInfo wire format with
    IdentifyObjectResponse (0x00C9) per AppraiseInfoParser docstring,
    so the new handler reuses the existing parser and pulls
    CreatureProfile.{Stamina, StaminaMax, Mana, ManaMax}.
  - Player's full learned spellbook also lands here (previously only
    item-scoped Identify responses fed the spellbook).

VitalsVM:
  - Constructor adds optional LocalPlayerState? parameter (default null
    keeps every existing caller compiling).
  - StaminaPercent / ManaPercent now read through to LocalPlayerState
    every access — no VM-side caching, so a server-side delta to the
    cache surfaces next frame without any explicit refresh.

GameWindow:
  - Public readonly LocalPlayer field alongside Combat / Chat / Items /
    SpellBook so plugins + future panels can bind directly.
  - WireAll call updated to pass LocalPlayer.
  - VitalsVM construction passes LocalPlayer so the existing
    VitalsPanel automatically picks up the two new bars.

Test counts:
  - AcDream.Core.Tests:           550 → 561  (+11 LocalPlayerStateTests)
  - AcDream.UI.Abstractions.Tests: 23 →  26  (+3 VitalsVM through-cache)
  - AcDream.Core.Net.Tests:       192 → 194  (+2 PlayerDescription wiring)
  - Total:                        765 → 781

Build: 0 warnings, 0 errors.

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

src/AcDream.App/Rendering/GameWindow.cs

@@ -280,6 +280,9 @@ public sealed class GameWindow : IDisposable
     public readonly AcDream.Core.Combat.CombatState Combat = new();
     public readonly AcDream.Core.Spells.Spellbook SpellBook = new();
     public readonly AcDream.Core.Items.ItemRepository Items = new();
+    // Issue #5 — caches CreatureProfile.{Stamina, Mana, *Max} from
+    // PlayerDescription so the Vitals HUD can render those bars.
+    public readonly AcDream.Core.Player.LocalPlayerState LocalPlayer = new();
 
     // Phase D.2a — ImGui devtools UI overlay. Null unless ACDREAM_DEVTOOLS=1.
     // See docs/plans/2026-04-24-ui-framework.md for the staged UI strategy.
@@ -890,8 +893,10 @@ public sealed class GameWindow : IDisposable
 
                 // VitalsVM: GUID=0 at construction; set later at EnterWorld
                 // (see the _playerServerGuid assignment path). Pre-login the
-                // HP bar just reads 1.0 (safe default) — harmless.
-                _vitalsVm = new AcDream.UI.Abstractions.Panels.Vitals.VitalsVM(Combat);
+                // HP bar just reads 1.0 (safe default) — harmless. Stam/Mana
+                // bars surface only after the first PlayerDescription has
+                // populated LocalPlayer (Issue #5).
+                _vitalsVm = new AcDream.UI.Abstractions.Panels.Vitals.VitalsVM(Combat, LocalPlayer);
                 _panelHost.Register(
                     new AcDream.UI.Abstractions.Panels.Vitals.VitalsPanel(_vitalsVm));
 
@@ -1169,7 +1174,7 @@ public sealed class GameWindow : IDisposable
             // notifications / spell learns / wield events all update
             // the corresponding client-side state without further glue.
             AcDream.Core.Net.GameEventWiring.WireAll(
-                _liveSession.GameEvents, Items, Combat, SpellBook, Chat);
+                _liveSession.GameEvents, Items, Combat, SpellBook, Chat, LocalPlayer);
 
             // Phase H.1: feed inbound HearSpeech into the chat log.
             _liveSession.SpeechHeard += speech =>