Add proxy positioning API and CK-placed pool

Add a ProxyGameAPI (F4TProxyGameAPI.h/.cpp) exposing PositionRemoteActor which centralizes positioning logic, play-space resolution, MoveRefrToPosition-style moves, and 20Hz throttling bypass for forced moves. Replace ad-hoc SetPosition/SetHeading calls across the proxy controller to use the new API, ensuring correct cell/worldspace migration, logging, and move-rate throttling.

Introduce support for Creation Kit placed proxy refs: detect CK-placed proxies by editor ID prefix or base form, populate a per-cell proxy pool, and prefer assigning CK-placed proxies for runtime remotes (with fallbacks). Update proxy spawn/holding logic (skip smooth frame once, handle settle states, preserve/reuse CK pool entries) and improve worldspace/cell mismatch checks to avoid incorrect movement across play spaces.

Other changes: add CommonwealthOnline.esp resource file, update setup.md with the new local FormID (0x002666) for COPlayerProxy, enable animation sync gating to require loaded 3D, and small logging/message improvements.

plugin/include/F4TProxyGameAPI.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include "RE/N/NiPoint3.h"
+
+namespace RE
+{
+	class Actor;
+}
+
+namespace F4T::ProxyGameAPI
+{
+	// Move a remote proxy into the local player's loaded play space at world coordinates.
+	// Uses the engine MoveRefrToPosition native (same path as Papyrus MoveTo) so parent
+	// cell/worldspace follow the local player across interior/exterior transitions.
+	// When true, bypass the 20 Hz MoveRefrToPosition throttle (snap/restore/holding moves).
+	void PositionRemoteActor(
+		RE::Actor& a_proxy,
+		const RE::NiPoint3& a_pos,
+		float a_headingZ,
+		bool a_force = false);
+
+	void PositionRemoteActor(
+		RE::Actor& a_proxy,
+		const RE::NiPoint3& a_pos,
+		const RE::NiPoint3& a_rot,
+		bool a_force = false);
+}