Update Rust version and refine toolchain documentation

- Set the Rust version to `1.85` in `Cargo.toml` to ensure compatibility with the latest features and improvements.
- Enhanced comments in `rust-toolchain.toml` to clarify the purpose of the toolchain configuration, emphasizing standardization of tooling and targets.

Author: TKorr

Cargo.toml

@@ -2,6 +2,7 @@
 name = "cachekit"
 version = "0.1.0-alpha"
 edition = "2024"
+rust-version = "1.85"
 license = "MIT OR Apache-2.0"
 description = "High-performance, policy-driven cache primitives for Rust systems (FIFO/LRU/ARC) with optional metrics."
 repository = "https://github.com/OxidizeLabs/cachekit"

rust-toolchain.toml

@@ -1,5 +1,5 @@
-# cachkit Rust toolchain configuration
-# This ensures all contributors use the same Rust version
+# cachekit Rust toolchain configuration
+# This standardizes tooling (rustfmt/clippy) and targets; the Rust version tracks the latest stable.
 
 [toolchain]
 channel = "stable"