Echo Protocol

## Echo Protocol 0.5.0-beta.2 — Hotfix 2

This update focuses on fixes discovered during extended external survival testing on Minecraft 1.21.11.

### Fixed

- Improved Echo visibility while keeping the target player's real Minecraft skin clearly recognizable.
- Reduced excessive transparency so Echoes are much easier to notice during normal gameplay.
- Echoes now use only very light transparency while remaining visually distinct from normal players.
- Fixed Memory Echoes frequently selecting idle, AFK, crafting, or mining segments instead of meaningful movement.
- Memory-based Echoes now prioritize continuous movement recordings when appropriate.
- Fixed Echoes repeatedly standing still and staring at the ground.
- Improved initial pitch/orientation for independent Echo types.
- Fixed Mimic movement issues caused by recorded absolute coordinates.
- Fixed Echo grounding on slabs and uneven terrain.
- Fixed Corrupted Memory progression being granted before a properly observable manifestation.
- Improved observation checks for several Echo-related advancements.
- Fixed rejected and unobserved events consuming excessively long cooldowns.
- Fixed failed/discontinuous events potentially leaving the Event Director locked.
- Added faster bounded retries after failed or unobserved manifestations.
- Improved Echo appearance sound readability.
- Improved cleanup and lifecycle handling for natural Echo events.
- Preserved collision-aware movement and blocked-route safety.
- Preserved real player skins and classic/slim model support.

### Testing

- 61/61 automated regression tests passing.
- Tested on Minecraft 1.21.11 with Fabric.
- Final build tested through Prism Launcher.
- Tested using natural survival gameplay and the real Event Director rather than relying only on spawn/debug commands.
- Dedicated Fabric server startup and shutdown verified.

### Compatibility

- Minecraft 1.21.11
- Fabric
- Java 21
- Fabric API required

### Note

This is a bug-fix and polish update for `0.5.0-beta.2`.

Larger gameplay additions and new horror behaviors are planned for a future beta.