chore: update dependencies and AGENTS.md

- Add mac_address crate for MAC address detection
- Add tempfile dev dependency for testing
- Update AGENTS.md with latest development guidelines

Cargo.toml

@@ -32,6 +32,7 @@ chrono = { version = "0.4", features = ["serde"] }
 sha2 = "0.10"
 hex = "0.4"
 uuid = { version = "1.0", features = ["v4"] }
+mac_address = "1.1"
 
  # Security
  subtle = "2.5"
@@ -123,3 +124,6 @@ path = "src/bin/integrated_player.rs"
 
 [build-dependencies]
 chrono = "0.4"
+
+[dev-dependencies]
+tempfile = "3"