feat(physics): R5-V1 — port PositionManager/Sticky/Constraint + TargetManager (Core, unwired)

The retail movement-manager family the R4 MoveToManager port left as
do-not-invent seams (decomp §9f/§9g). Faithful C# ports of retail's
PositionManager facade + StickyManager + ConstraintManager + the
TargetManager voyeur system, with full conformance tests. NO wiring yet
— purely additive, no behavior change. Wiring (retiring TS-39 sticky +
AP-79 target adapter) is R5-V2/V3.

New Core classes (src/AcDream.Core/Physics/Motion/):
- StickyManager (0x00555400): follow-a-target steering. adjust_offset's
  dense x87 mush decoded via ACE (StickyRadius 0.3, StickyTime 1.0,
  follow speed ×5 / fallback 15) — speed-clamped signed-distance steer +
  bounded turn-to-face; 1 s watchdog; Ok→initialized / non-Ok→teardown.
- ConstraintManager (0x00556090): the server-position rubber-band leash.
  90% IsFullyConstrained jump gate + grounded linear brake taper.
  Structural only — acdream never ARMS it (retail arms from
  SmartBox::HandleReceivedPosition, which acdream lacks, with two x87
  constants BN elided). IsFullyConstrained stays false = TS-35 behavior;
  leash-arming + the unknown constants are a deferred issue.
- PositionManager facade (0x00555160): lazy Sticky/Constraint + fan-out.
- TargetManager (0x0051a370) + TargettedVoyeurInfo: the peer-to-peer
  voyeur subscription system (0.5 s throttle, 10 s staleness,
  send-on-drift-past-radius, dead-reckon GetInterpolatedPosition). A
  faithful superset of the AP-79 adapter — SetTarget subscribes ON the
  target; the target's HandleTargetting pushes updates back.
- IPhysicsObjHost: the CPhysicsObj back-pointer seam (position/velocity/
  radius/contact/GetObjectA + target-tracking fan-out) the App wires per
  entity in V2/V3. MotionDeltaFrame: mutable retail-Frame delta accumulator.

Supporting:
- TargetInfo extended to the full retail 10-field struct (additive
  defaults keep the R4 4-arg call sites compiling).
- MoveToMath: signed CylinderDistanceNoZ, NormalizeCheckSmall,
  GlobalToLocalVec.
- Rename: the misnamed AcDream.Core.Physics.PositionManager (a remote
  anim+interp per-frame combiner, NOT the retail facade) → RemoteMotion
  Combiner, freeing the name and removing the ambiguity that breaks every
  file importing both Physics + Physics.Motion (GameWindow will in V2/V3).

Tests: 42 new conformance cases (Sticky/Constraint/Position facade +
TargetManager incl. the full cross-entity voyeur round-trip). Full suite
4006 green (+2 skipped), no regressions.

Decomp + ACE cross-ref + port plan: docs/research/2026-07-03-r5-managers/.

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

src/AcDream.Core/Physics/Motion/MotionDeltaFrame.cs

@@ -0,0 +1,40 @@
+using System.Numerics;
+
+namespace AcDream.Core.Physics.Motion;
+
+/// <summary>
+/// Mutable stand-in for retail's <c>Frame</c> when it is used as the per-tick
+/// <b>delta accumulator</b> that <c>PositionManager::adjust_offset</c> and its
+/// three sub-managers (Interpolation / Sticky / Constraint) write into
+/// (retail arg2, e.g. <c>StickyManager::adjust_offset</c> 0x00555430,
+/// <c>ConstraintManager::adjust_offset</c> 0x00556180). acdream's
+/// <see cref="CellFrame"/> is an immutable record — retail's per-tick math
+/// mutates <c>m_fOrigin</c> in place across the interp→sticky→constraint chain
+/// (each sub-manager composes on top of the previous one's write), so the
+/// accumulator needs a mutable shape.
+///
+/// <para><see cref="Origin"/> = retail <c>m_fOrigin</c> (the accumulated
+/// position delta, in the mover's LOCAL frame after
+/// <c>Position::globaltolocalvec</c>). <see cref="Orientation"/> carries the
+/// heading retail's <c>Frame::set_heading</c> writes; read/write it as a
+/// compass heading via <see cref="GetHeading"/> / <see cref="SetHeading"/>
+/// (P5 convention, degrees).</para>
+/// </summary>
+public sealed class MotionDeltaFrame
+{
+    /// <summary>Retail <c>m_fOrigin</c> — the accumulated per-tick position
+    /// delta (mover-local frame).</summary>
+    public Vector3 Origin;
+
+    /// <summary>Retail <c>Frame</c> rotation — carries the
+    /// <c>Frame::set_heading</c> output.</summary>
+    public Quaternion Orientation = Quaternion.Identity;
+
+    /// <summary>Retail <c>Frame::get_heading</c> (P5 compass degrees).</summary>
+    public float GetHeading() => MoveToMath.GetHeading(Orientation);
+
+    /// <summary>Retail <c>Frame::set_heading(headingDeg)</c> — pure
+    /// yaw-about-Z setter (P5 compass degrees).</summary>
+    public void SetHeading(float headingDeg) =>
+        Orientation = MoveToMath.SetHeading(Orientation, headingDeg);
+}