scaffold the CLI, logging and turn research into TODOs

Cargo.toml

@@ -0,0 +1,30 @@
+[workspace]
+members = ["xtask"]
+resolver = "3"
+
+[workspace.package]
+edition = "2024"
+license = "MIT OR Apache-2.0"
+
+[workspace.dependencies]
+anyhow = "1.0.100"
+clap = { version = "4.5.56", features = ["derive"] }
+
+[package]
+name = "git-identity"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+
+[dependencies]
+anyhow.workspace = true
+clap.workspace = true
+thiserror = "2.0.18"
+tracing = "0.1.44"
+tracing-subscriber = { version = "0.3.22", features = ["env-filter"] }
+
+[profile.release]
+lto = true
+opt-level = 3
+codegen-units = 1
+debug = false