Prepare v0.1.1 release for crates.io

- Rename `macros` crate to `libmarathon-macros` for better discoverability on crates.io
- Update all imports from `macros::` to `libmarathon_macros::`
- Add crates.io metadata (description, license, repository, homepage, etc.)
- Bump version to 0.1.1
- Add version requirement for libmarathon-macros dependency

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

crates/libmarathon/Cargo.toml

@@ -1,7 +1,14 @@
 [package]
 name = "libmarathon"
-version = "0.1.0"
+version = "0.1.1"
 edition.workspace = true
+description = "A peer-to-peer game engine development kit with CRDT-based state synchronization"
+license = "MIT"
+repository = "https://github.com/r3t-studios/marathon"
+homepage = "https://github.com/r3t-studios/marathon"
+readme = "../../README.md"
+keywords = ["gamedev", "p2p", "crdt", "multiplayer", "bevy"]
+categories = ["game-engines", "network-programming"]
 
 [dependencies]
 anyhow.workspace = true
@@ -23,7 +30,7 @@ bevy_math = "0.17.2"
 bevy_mesh = "0.17.2"
 bevy_platform = { version = "0.17.2", default-features = false }
 bevy_reflect = "0.17.2"
-macros = { path = "../macros" }
+libmarathon-macros = { version = "0.1.1", path = "../macros" }
 bevy_shader = "0.17.2"
 bevy_tasks = "0.17.2"
 bevy_time = "0.17.2"