feat(grid-agent): establish architecture and config (#118)

crates/metacrate-grid-agent/Cargo.toml

@@ -0,0 +1,31 @@
+[package]
+name = "metacrate-grid-agent"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+repository.workspace = true
+description = "Bounded pure-Rust OpenSim grid-agent service foundation"
+publish = false
+
+[dependencies]
+libremetaverse = { version = "0.0.1", path = "../libremetaverse", default-features = false, optional = true }
+libremetaverse-types = { version = "0.0.1", path = "../libremetaverse-types" }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+tokio = { version = "1.53.1", features = ["macros", "rt", "sync", "time"] }
+url = "2.5.8"
+
+[target.'cfg(any(unix, windows))'.dependencies]
+tokio = { version = "1.53.1", features = ["rt-multi-thread", "signal"] }
+
+[features]
+default = []
+live-grid = ["dep:libremetaverse"]
+
+[lints]
+workspace = true
+
+[[bin]]
+name = "metacrate-grid-agent"
+path = "src/main.rs"