feat(components): add ThermoState generators and Eurovent backend demo

crates/components/Cargo.toml

@@ -7,9 +7,17 @@ description = "Core component trait definitions for Entropyk thermodynamic simul
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/entropyk/entropyk"
 
+[features]
+default = []
+ffi = []
+http = []
+
 [dependencies]
-# Core types will be added when core crate is created
-# entropyk-core = { path = "../core" }
+# Core types from Story 1.2
+entropyk-core = { path = "../core" }
+
+# Fluid properties backend (Story 5.1 - FluidBackend integration)
+entropyk-fluids = { path = "../fluids" }
 
 # Error handling
 thiserror = "1.0"
@@ -18,8 +26,8 @@ thiserror = "1.0"
 serde = { version = "1.0", features = ["derive"] }
 
 [dev-dependencies]
-# Testing utilities
-# tokio-test = "0.4"
+# Floating-point assertions
+approx = "0.5"
 
 [lib]
 name = "entropyk_components"