Fix ledge transitions and root motion loops (#91)

## Summary

- resolve each ledge action to the walkable segment on the stage-interior side
- preserve repeating root-motion displacement across every animation cycle
- add regression coverage for left/right ledge segments and multiple root-motion wraps
- Implement ledge intangibility

Reviewed-on: #91
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

Cargo.toml

@@ -45,11 +45,6 @@ fixed_math = "0.4.1"
 [profile.dev.package."*"]
 opt-level = 3
 
-# The rollback simulation runs multiple times per rendered frame in sync-test
-# mode, so optimizing the game crate is important even for development builds.
-[profile.dev]
-opt-level = 1
-
 [profile.production]
 inherits = "release"
 lto = "thin"