refactor: workspace scaffolding — sunbeam-sdk + sunbeam binary crate

Convert the single binary crate into a Cargo workspace with two members:
sunbeam-sdk (library) and sunbeam (thin binary). Moves build.rs to the
SDK with adjusted .git/HEAD path for the nested layout.

Cargo.toml

@@ -1,63 +1,3 @@
-[package]
-name = "sunbeam"
-version = "0.1.0"
-edition = "2024"
-description = "Sunbeam local dev stack manager"
-
-[dependencies]
-# Core
-thiserror = "2"
-tokio = { version = "1", features = ["full"] }
-clap = { version = "4", features = ["derive"] }
-serde = { version = "1", features = ["derive"] }
-serde_json = "1"
-serde_yaml = "0.9"
-tracing = "0.1"
-tracing-subscriber = { version = "0.3", features = ["env-filter"] }
-
-# Kubernetes
-kube = { version = "0.99", features = ["client", "runtime", "derive", "ws"] }
-k8s-openapi = { version = "0.24", features = ["v1_32"] }
-
-# HTTP + TLS
-reqwest = { version = "0.12", features = ["json", "rustls-tls", "blocking"] }
-rustls = { version = "0.23", features = ["ring"] }
-
-# SSH
-russh = "0.46"
-russh-keys = "0.46"
-
-# Crypto
-rsa = "0.9"
-pkcs8 = { version = "0.10", features = ["pem"] }
-pkcs1 = { version = "0.7", features = ["pem"] }
-sha2 = "0.10"
-hmac = "0.12"
-base64 = "0.22"
-rand = "0.8"
-
-# Certificate generation
-rcgen = "0.14"
-
-# SMTP
-lettre = { version = "0.11", default-features = false, features = ["smtp-transport", "tokio1-rustls-tls", "builder", "hostname"] }
-
-# Archive handling
-flate2 = "1"
-tar = "0.4"
-
-# Async
-futures = "0.3"
-tokio-stream = "0.1"
-
-# Utility
-tempfile = "3"
-dirs = "5"
-chrono = { version = "0.4", features = ["serde"] }
-
-[build-dependencies]
-reqwest = { version = "0.12", features = ["blocking", "rustls-tls"] }
-sha2 = "0.10"
-flate2 = "1"
-tar = "0.4"
-chrono = "0.4"
+[workspace]
+members = ["sunbeam-sdk", "sunbeam"]
+resolver = "3"

sunbeam-sdk/Cargo.toml

@@ -0,0 +1,65 @@
+[package]
+name = "sunbeam-sdk"
+version = "0.1.0"
+edition = "2024"
+description = "Sunbeam SDK — reusable library for cluster management"
+
+[features]
+default = []
+cli = ["clap"]
+
+[dependencies]
+# Core
+thiserror = "2"
+tokio = { version = "1", features = ["full"] }
+clap = { version = "4", features = ["derive"], optional = true }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+serde_yaml = "0.9"
+tracing = "0.1"
+
+# Kubernetes
+kube = { version = "0.99", features = ["client", "runtime", "derive", "ws"] }
+k8s-openapi = { version = "0.24", features = ["v1_32"] }
+
+# HTTP + TLS
+reqwest = { version = "0.12", features = ["json", "rustls-tls", "blocking"] }
+
+# SSH
+russh = "0.46"
+russh-keys = "0.46"
+
+# Crypto
+rsa = "0.9"
+pkcs8 = { version = "0.10", features = ["pem"] }
+pkcs1 = { version = "0.7", features = ["pem"] }
+sha2 = "0.10"
+hmac = "0.12"
+base64 = "0.22"
+rand = "0.8"
+
+# Certificate generation
+rcgen = "0.14"
+
+# SMTP
+lettre = { version = "0.11", default-features = false, features = ["smtp-transport", "tokio1-rustls-tls", "builder", "hostname"] }
+
+# Archive handling
+flate2 = "1"
+tar = "0.4"
+
+# Async
+futures = "0.3"
+tokio-stream = "0.1"
+
+# Utility
+tempfile = "3"
+dirs = "5"
+chrono = { version = "0.4", features = ["serde"] }
+
+[build-dependencies]
+reqwest = { version = "0.12", features = ["blocking", "rustls-tls"] }
+sha2 = "0.10"
+flate2 = "1"
+tar = "0.4"
+chrono = "0.4"

sunbeam-sdk/build.rs

@@ -0,0 +1,132 @@
+use flate2::read::GzDecoder;
+use std::env;
+use std::fs;
+use std::io::Read;
+use std::path::PathBuf;
+use std::process::Command;
+use tar::Archive;
+
+const KUSTOMIZE_VERSION: &str = "v5.8.1";
+const HELM_VERSION: &str = "v4.1.0";
+
+fn main() {
+    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
+    let target = env::var("TARGET").unwrap_or_default();
+    let (os, arch) = parse_target(&target);
+
+    download_and_embed("kustomize", KUSTOMIZE_VERSION, &os, &arch, &out_dir);
+    download_and_embed("helm", HELM_VERSION, &os, &arch, &out_dir);
+
+    // Set version info from git
+    let commit = git_commit_sha();
+    println!("cargo:rustc-env=SUNBEAM_COMMIT={commit}");
+
+    // Build target triple and build date
+    println!("cargo:rustc-env=SUNBEAM_TARGET={target}");
+    let date = chrono::Utc::now().format("%Y-%m-%d").to_string();
+    println!("cargo:rustc-env=SUNBEAM_BUILD_DATE={date}");
+
+    // Rebuild if git HEAD changes (workspace root is two levels up)
+    println!("cargo:rerun-if-changed=../../.git/HEAD");
+}
+
+fn parse_target(target: &str) -> (String, String) {
+    let os = if target.contains("darwin") {
+        "darwin"
+    } else if target.contains("linux") {
+        "linux"
+    } else if cfg!(target_os = "macos") {
+        "darwin"
+    } else {
+        "linux"
+    };
+
+    let arch = if target.contains("aarch64") || target.contains("arm64") {
+        "arm64"
+    } else if target.contains("x86_64") || target.contains("amd64") {
+        "amd64"
+    } else if cfg!(target_arch = "aarch64") {
+        "arm64"
+    } else {
+        "amd64"
+    };
+
+    (os.to_string(), arch.to_string())
+}
+
+fn download_and_embed(tool: &str, version: &str, os: &str, arch: &str, out_dir: &PathBuf) {
+    let dest = out_dir.join(tool);
+    if dest.exists() {
+        return;
+    }
+
+    let url = match tool {
+        "kustomize" => format!(
+            "https://github.com/kubernetes-sigs/kustomize/releases/download/\
+             kustomize%2F{version}/kustomize_{version}_{os}_{arch}.tar.gz"
+        ),
+        "helm" => format!(
+            "https://get.helm.sh/helm-{version}-{os}-{arch}.tar.gz"
+        ),
+        _ => panic!("Unknown tool: {tool}"),
+    };
+
+    let extract_path = match tool {
+        "kustomize" => "kustomize".to_string(),
+        "helm" => format!("{os}-{arch}/helm"),
+        _ => unreachable!(),
+    };
+
+    eprintln!("cargo:warning=Downloading {tool} {version} for {os}/{arch}...");
+
+    let response = reqwest::blocking::get(&url)
+        .unwrap_or_else(|e| panic!("Failed to download {tool}: {e}"));
+    let bytes = response
+        .bytes()
+        .unwrap_or_else(|e| panic!("Failed to read {tool} response: {e}"));
+
+    let decoder = GzDecoder::new(&bytes[..]);
+    let mut archive = Archive::new(decoder);
+
+    for entry in archive.entries().expect("Failed to read tar entries") {
+        let mut entry = entry.expect("Failed to read tar entry");
+        let path = entry
+            .path()
+            .expect("Failed to read entry path")
+            .to_path_buf();
+        if path.to_string_lossy() == extract_path {
+            let mut data = Vec::new();
+            entry
+                .read_to_end(&mut data)
+                .expect("Failed to read binary");
+            fs::write(&dest, &data).expect("Failed to write binary");
+
+            #[cfg(unix)]
+            {
+                use std::os::unix::fs::PermissionsExt;
+                fs::set_permissions(&dest, fs::Permissions::from_mode(0o755))
+                    .expect("Failed to set permissions");
+            }
+
+            eprintln!("cargo:warning=Embedded {tool} ({} bytes)", data.len());
+            return;
+        }
+    }
+
+    panic!("Could not find {extract_path} in {tool} archive");
+}
+
+fn git_commit_sha() -> String {
+    Command::new("git")
+        .args(["rev-parse", "--short=8", "HEAD"])
+        .output()
+        .ok()
+        .and_then(|o| {
+            if o.status.success() {
+                Some(String::from_utf8_lossy(&o.stdout).trim().to_string())
+            } else {
+                None
+            }
+        })
+        .unwrap_or_else(|| "unknown".to_string())
+}

sunbeam/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "sunbeam"
+version = "0.1.0"
+edition = "2024"
+description = "Sunbeam local dev stack manager"
+
+[[bin]]
+name = "sunbeam"
+path = "src/main.rs"
+
+[dependencies]
+sunbeam-sdk = { path = "../sunbeam-sdk", features = ["cli"] }
+tokio = { version = "1", features = ["full"] }
+clap = { version = "4", features = ["derive"] }
+chrono = "0.4"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+rustls = { version = "0.23", features = ["ring"] }