docs: Update C++ integration guide and blueprint specifications for various systems, adding detailed setup instructions and clarifying implementation statuses

docs/blueprints/02-player/11_BPC_MovementStateSystem.md

@@ -1,5 +1,9 @@
 # 11 — Movement State System (`BPC_MovementStateSystem`)
 
+> **⚡ C++ Status: Stub** — `Source/PG_Framework/Public/Player/BPC_MovementStateSystem.h` provides the UCLASS shell, `CurrentMovementMode` GameplayTag variable, and `OnMovementModeChanged` dispatcher. **The C++ stub has NO gameplay logic.** **Create a BP child** and build ALL logic: CMC reads, posture detection (standing/crouching/prone), sprint state, footstep events, GASP ABP variable bridge. See `docs/developer/cpp-integration-guide.md`.
+>
+> ---
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 ## Purpose
 Tracks the player's current movement mode and posture state. Acts as a central query point for other systems (animations, stamina, audio, camera) to react to how the player is moving. Does not control movement input — only reports and reacts to state changes.