feat(physics): Campaign P P1 - stat-coupled movement (burden/stamina/vitae)

Ports the retail CACQualities/EncumbranceSystem/MovementSystem chain
(named-retail decomp pc 256393/412901-414050/416169-416320/695958+) so
PlayerWeenie's run rate, jump height, jump permission, and jump stamina
cost are real functions of burden, current stamina, and vitae/skill
enchantments instead of stubs.

Core:
- New EncumbranceSystem.cs (delegates to the already-verified
  BurdenMath formulas — one source of truth for the burden HUD and
  movement physics) and MovementSystem.cs (GetRunRate/GetJumpHeight/
  JumpStaminaCost/GetJumpPower, decomp-cited; ACE cross-referenced
  where BN dropped the general-case arithmetic entirely).
- PlayerWeenie rewritten as the CACQualities-shaped composition:
  CanJump gates on burden (<2.0 load, UN-8 — x87 polarity resolved by
  plausibility, Ghidra MCP unavailable this slice), JumpStaminaCost
  returns the real ceil((load+0.5)*power*8+2) cost and always affords
  it (matches decomp — retail's own function never refuses; "weak"
  jump comes entirely from the stamina==0 skill-zeroing gate inside
  InqRunRate/InqJumpVelocity, not a hard refusal), SetStamina wires a
  null="unknown, don't gate" sentinel preserving every pre-P1 test.
- EnchantmentMath.GetMod gained an optional StatModType flag filter
  (GetSkillMod convenience wrapper) so the SAME vitae/family-stacking
  machinery already used for vital-max buffs now also answers "what's
  the vitae+skill-enchantment-adjusted Run/Jump skill" — reusing the
  M3 active-enchantment state, not a new engine.

Runtime:
- RuntimeCharacterState now stores the pre-EnchantSkill base run/jump
  skill and recomputes the adjusted value (vitae first, then matching
  Skill-flagged buffs, floor 0.5, truncate) on every base push AND on
  every Spellbook.EnchantmentsChanged notification — a vitae change
  alone moves the produced rate without a fresh PlayerDescription.
- RuntimeMovementSkillState extended with Burden/CurrentStamina
  (RuntimeMovementSkillProjection.ApplyTo pushes both through the
  existing seam); LiveSessionEventRouter recomputes burden from the
  same Strength+aug-property+EncumbranceVal inputs the burden HUD
  already assembles (reacting to the same ClientObjectTable events)
  and pushes current stamina from LocalPlayerState vital updates.
- Wires the previously dead-lettered ReportExhaustion() R3-W4 seam:
  LiveSessionRuntimeFactory's OnMovementStatsUpdated callback re-
  applies the current snapshot to the live controller and forces an
  immediate movement re-evaluation on any skill/burden/stamina change.

Register: retires TS-5 (CanJump/JumpStaminaCost stubs) and AP-25 (no
vitae in pushed skill). Adds AP-127 (two minor unmodeled retail bonus
properties + the stamina-buff-adjusts-local-copy nuance, deliberately
out of the bounded "run/jump query path only" scope) and UN-8 (the
CanJump x87 polarity call, flagged for a future Ghidra MCP
confirmation pass). Extends TS-23 (PlayerKillerStatus not parsed) to
cover JumpStaminaCost's new pk parameter, hardcoded false pending P3.

Full pseudocode + retail citations + the vitae/skill-level finding in
docs/research/2026-07-30-stat-coupled-movement-pseudocode.md.

Release suite: Core.Tests 3977/2 skips, Runtime.Tests 425/0 skips,
App.Tests 3968/3 skips — all green. (One pre-existing, unrelated Debug-
only flake in LandblockBuildOriginTests reproduces on the pre-P1
baseline and passes in Release; not touched here.)

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

tests/AcDream.Runtime.Tests/Session/LiveSessionEventRouterTests.cs

@@ -5,6 +5,7 @@ using AcDream.Core.Combat;
 using AcDream.Core.Items;
 using AcDream.Core.Net;
 using AcDream.Core.Player;
+using AcDream.Core.Properties;
 using AcDream.Core.Social;
 using AcDream.Core.Spells;
 using AcDream.Runtime.Session;
@@ -180,6 +181,111 @@ public sealed class LiveSessionEventRouterTests
         Assert.Equal(baselineGameEvents, session.GameEvents.RegisteredHandlerCount);
     }
 
+    // ── Campaign P Slice P1 (2026-07-30): burden/stamina recompute wiring ─
+
+    [Fact]
+    public void ObjectTablePropertyChange_RecomputesAndPushesBurden()
+    {
+        using var session = NewSession();
+        const uint playerGuid = 0x50000001u;
+        var objects = new ClientObjectTable();
+        var character = new RuntimeCharacterState();
+        int movementStatsUpdated = 0;
+
+        var router = new LiveSessionEventRouter(
+            session,
+            NoOpEntitySink(),
+            NoOpEnvironmentSink(),
+            new LiveInventorySessionBindings(
+                objects,
+                PlayerGuid: () => playerGuid,
+                OnShortcuts: null,
+                OnUseDone: null,
+                ItemMana: new ItemManaState(),
+                ExternalContainers: new ExternalContainerState()),
+            new LiveCharacterSessionBindings(
+                new CombatState(),
+                character,
+                ResolveSkillFormulaBonus: null,
+                OnSkillsUpdated: null,
+                OnConfirmationRequest: null,
+                OnConfirmationDone: null,
+                ClientTime: () => 0d,
+                OnMovementStatsUpdated: () => movementStatsUpdated++),
+            NewSocialBindings());
+
+        router.Attach();
+
+        // Strength=100, no augmentation -> capacity=15000 (BurdenMath).
+        character.LocalPlayer.OnAttributeUpdate(
+            atType: 1u, ranks: 90u, start: 10u, xp: 0u);
+        Assert.Equal(1, movementStatsUpdated);
+        Assert.Equal(0f, character.MovementSkills.Burden, precision: 4);
+
+        // EncumbranceVal (property 5) = 7500 -> load = 7500/15000 = 0.5.
+        var props = new PropertyBundle();
+        props.Ints[(uint)PropertyInt.EncumbranceVal] = 7500;
+        objects.UpsertProperties(playerGuid, props);
+
+        Assert.True(movementStatsUpdated >= 2);
+        Assert.Equal(0.5f, character.MovementSkills.Burden, precision: 4);
+
+        router.Dispose();
+    }
+
+    [Fact]
+    public void StaminaVitalChange_PushesCurrentStamina()
+    {
+        using var session = NewSession();
+        var character = new RuntimeCharacterState();
+        int movementStatsUpdated = 0;
+
+        var router = new LiveSessionEventRouter(
+            session,
+            NoOpEntitySink(),
+            NoOpEnvironmentSink(),
+            NewInventoryBindings(),
+            new LiveCharacterSessionBindings(
+                new CombatState(),
+                character,
+                ResolveSkillFormulaBonus: null,
+                OnSkillsUpdated: null,
+                OnConfirmationRequest: null,
+                OnConfirmationDone: null,
+                ClientTime: () => 0d,
+                OnMovementStatsUpdated: () => movementStatsUpdated++),
+            NewSocialBindings());
+
+        router.Attach();
+        Assert.Equal(-1, character.MovementSkills.CurrentStamina);
+
+        character.LocalPlayer.OnVitalUpdate(
+            vitalId: 8u, ranks: 40u, start: 20u, xp: 0u, current: 45u);
+
+        Assert.Equal(1, movementStatsUpdated);
+        Assert.Equal(45, character.MovementSkills.CurrentStamina);
+
+        router.Dispose();
+    }
+
+    private static LiveEntitySessionSink NoOpEntitySink() => new(
+        Spawned: _ => { },
+        Deleted: _ => { },
+        PickedUp: _ => { },
+        MotionUpdated: _ => { },
+        PositionUpdated: _ => { },
+        VectorUpdated: _ => { },
+        StateUpdated: _ => { },
+        ParentUpdated: _ => { },
+        TeleportStarted: _ => { },
+        AppearanceUpdated: _ => { },
+        PlayPhysicsScript: _ => { },
+        PlayPhysicsScriptType: _ => { });
+
+    private static LiveEnvironmentSessionSink NoOpEnvironmentSink() => new(
+        EnvironChanged: _ => { },
+        ServerTimeUpdated: _ => { });
+
     private static LiveSessionEventRouter NewRouter(
         WorldSession session,
         Counters counters,