Milestone 1: workspace skeleton, wire protocol, socket round-trip

Three-crate workspace per SPECS.md. varde-proto defines the full JSON
Lines protocol (requests, envelopes, structured errors, events) with
string-typed hashes so the crate carries no iroh dependency. The daemon
binds its unix socket, loads config with flags > env > file > defaults
precedence, and answers status/list; everything else returns a
structured "unimplemented" error. varde-ctl maps subcommands 1:1 onto
requests and round-trips status against a real daemon in the tests.

Dependencies: serde/serde_json (wire format), tokio (async runtime and
unix sockets), tracing/tracing-subscriber (structured logging), toml
(config file), anyhow (binary-edge errors), thiserror (reserved for
library errors), clap (ctl flag parsing, per spec), tempfile (dev-only,
ephemeral test dirs).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Cargo.toml

@@ -0,0 +1,26 @@
+[workspace]
+resolver = "2"
+members = ["varde-proto", "varde-daemon", "varde-ctl"]
+
+[workspace.package]
+version = "0.1.0"
+edition = "2021"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/bendiklh/varde"
+rust-version = "1.85"
+
+[workspace.dependencies]
+varde-proto = { path = "varde-proto" }
+
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+thiserror = "2"
+anyhow = "1"
+tokio = { version = "1", features = ["macros", "rt-multi-thread", "net", "io-util", "signal", "sync", "time", "fs"] }
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+clap = { version = "4", features = ["derive", "env"] }
+toml = "0.8"
+
+[profile.release]
+lto = "thin"