Add optional apparel sync (equippedItems)

Introduce an optional equippedItems transform extension to snapshot tracked visible apparel slots. Plugin: capture local equipped ARMO form IDs on the game-thread, include equippedItems in transform packets, parse equippedItems on the networking thread, and apply/clear synced apparel on runtime proxies (with defensive logging for missing forms). Server: fake_client parses and prints equippedItems. Docs and protocol updated; changelog and dev-log entry added. Backwards-compatible: equippedItems is optional and empty formId denotes intentional unequip.

protocol/player-sync.md

@@ -59,8 +59,11 @@ isMoving
 isSprinting
 isSneaking
 isJumping
+isCrouching
 weaponDrawn
 movementSpeed
+animationGraphSpeed
+equippedItems
 lastReceivedLocalTime
 ```
 
@@ -71,6 +74,11 @@ Movement state fields are also optional and default to not moving, not
 sprinting, not sneaking, not jumping, weapon holstered, and speed `0.0` when
 missing.
 
+`equippedItems` is also optional. New clients send it as a complete snapshot of
+tracked visible apparel slots with `{ slot, formId }` entries; empty `formId`
+values mean that tracked slot is intentionally unequipped. Older clients can
+omit the field and receivers keep the proxy's existing/default appearance.
+
 This model proves the data shape and lifecycle before spawning remote actors.
 For the current visual milestone, the controller represents only one remote
 player and chooses the lowest available `playerId` if more than one remote
@@ -104,6 +112,9 @@ player exists.
   resuming smoothing.
 - Transform packets include movement state data (`isMoving`, `movementSpeed`,
   `isSprinting`, `isSneaking`, `isJumping`, `weaponDrawn`).
+- Transform packets can include optional `equippedItems` snapshots for visible
+  clothing, armor, hats, and eyewear slots. The game-thread proxy controller
+  applies those snapshots after proxy 3D is loaded.
 - The plugin suppresses transform sends and proxy representation in the
   `COVault109` solo cell.
 - The game-thread proxy controller applies confirmed Havok animation graph
@@ -135,12 +146,13 @@ variable writes drive proxy locomotion visuals.
 
 - Increase concurrent proxy cap beyond four players per client
 - Cross-cell actor transfer without respawn (if respawn proves insufficient)
+- Power armor and weapon model sync
 
 ## Not Required Yet
 
 - Full animation graph sync
 - Combat sync
-- Inventory sync
+- Full inventory sync beyond visible equipped apparel
 - Quest sync
 - Dialogue sync
 - Settlement sync