chore: add the Rust workspace

This repo holds both languages, so it needs both workspaces. Layout is the same
rule on each side — apps/ for what runs, crates/ and packages/ for what is
shared, split by what a thing is rather than what it is written in.

Members are empty because nothing has moved in yet. Versions are pinned once at
the root so two crates cannot disagree about a dependency.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Cargo.toml

@@ -0,0 +1,33 @@
+# The Rust half of this monorepo. The JS/TS half is `package.json`.
+#
+# Layout, per the same rule on both sides: split by *what a thing is*, not by
+# what language it is written in.
+#
+#   apps/       deployables — a binary someone runs
+#   crates/     shared Rust — a library another crate depends on
+#   packages/   shared JS/TS
+#
+# Members are added as components move in. An empty list is honest: nothing has
+# landed yet.
+
+[workspace]
+resolver = "3"
+members = []
+
+# One pin per dependency, here. A member never writes a version — that is what
+# stops two crates in one tree from disagreeing about tokio.
+[workspace.dependencies]
+anyhow = "1"
+clap = { version = "4", features = ["derive", "env"] }
+libc = "0.2"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+thiserror = "2"
+tokio = { version = "1", features = ["full"] }
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+
+[workspace.package]
+edition = "2024"
+license = "Apache-2.0"
+repository = "https://github.com/nestrilabs/nestri"