diff --git a/workshop-baker/src/prebake.rs b/workshop-baker/src/prebake.rs
index b214ee0..a902a58 100644
--- a/workshop-baker/src/prebake.rs
+++ b/workshop-baker/src/prebake.rs
@@ -154,7 +154,8 @@ pub async fn prebake(
             .map(|c| c.repology_endpoint)
             .unwrap_or(workshop_engine::RepologyEndpoint::Default);
 
-        let pm_name = dependencies.system
+        let pm_name = dependencies
+            .system
             .as_ref()
             .and_then(|sys| sys.keys().next().cloned());
 
diff --git a/workshop-baker/src/prebake/error.rs b/workshop-baker/src/prebake/error.rs
index 2656f38..9581377 100644
--- a/workshop-baker/src/prebake/error.rs
+++ b/workshop-baker/src/prebake/error.rs
@@ -64,4 +64,4 @@ pub enum BootstrapError {
 
     #[error("Invalid bootstrap configuration: {0}")]
     InvalidConfig(String),
-    }
+}
diff --git a/workshop-baker/src/prebake/stage/bootstrap.rs b/workshop-baker/src/prebake/stage/bootstrap.rs
index 104d725..d2c1fd5 100644
--- a/workshop-baker/src/prebake/stage/bootstrap.rs
+++ b/workshop-baker/src/prebake/stage/bootstrap.rs
@@ -57,7 +57,10 @@ pub async fn bootstrap(
         match BootstrapSource::parse(&raw) {
             BootstrapSource::Inline(script) => {
                 if ctx.dry_run {
-                    log::info!("[DRY_RUN] User provided inline bootstrap script:\n{}", script);
+                    log::info!(
+                        "[DRY_RUN] User provided inline bootstrap script:\n{}",
+                        script
+                    );
                     return Ok(());
                 }
                 log::debug!("Using inline bootstrap script ({} bytes)", script.len());
@@ -86,13 +89,16 @@ pub async fn bootstrap(
                 // Should support: checksum verification, retry, timeout.
                 log::info!("Custom bootstrap from URL: {}", url);
                 log::info!("  Target: {}", bootstrap_path.display());
-                unimplemented!("HTTP bootstrap fetching requires bakerd-level network infrastructure");
+                unimplemented!(
+                    "HTTP bootstrap fetching requires bakerd-level network infrastructure"
+                );
             }
             BootstrapSource::File(path) => {
                 // Local file copy. This is the simplest case — we can implement
                 // this directly without bakerd infrastructure.
                 log::info!("Custom bootstrap from local file: {}", path);
-                tokio::fs::copy(&path, &bootstrap_path).await
+                tokio::fs::copy(&path, &bootstrap_path)
+                    .await
                     .map_err(BootstrapError::IOError)?;
             }
         }
@@ -166,7 +172,8 @@ impl BootstrapSource {
         if let Some(name) = raw.strip_prefix("server://") {
             return BootstrapSource::Server(name.to_string());
         }
-        if let Some(url) = raw.strip_prefix("https://")
+        if let Some(url) = raw
+            .strip_prefix("https://")
             .or_else(|| raw.strip_prefix("http://"))
         {
             return BootstrapSource::Http(url.to_string());
@@ -325,9 +332,7 @@ fn generate_bootstrap(
 ///
 /// Returns `Some(Box<dyn PackageManager>)` if a configured package manager is known,
 /// or `None` if no package manager is configured or recognized.
-fn get_package_manager(
-    config: &PrebakeConfig,
-) -> Option<Box<dyn pm::PackageManager>> {
+fn get_package_manager(config: &PrebakeConfig) -> Option<Box<dyn pm::PackageManager>> {
     config
         .dependencies
         .as_ref()
diff --git a/workshop-engine/src/pm.rs b/workshop-engine/src/pm.rs
index dd0f746..3a7f8ef 100644
--- a/workshop-engine/src/pm.rs
+++ b/workshop-engine/src/pm.rs
@@ -14,7 +14,6 @@ pub trait PackageManager {
     /// Returns the name of the package manager.
     fn name(&self) -> &'static str;
 
-
     /// Returns the binary name of the package manager.
     fn binary(&self) -> &'static str;
 
@@ -24,7 +23,6 @@ pub trait PackageManager {
     /// Generates commands to install the specified packages.
     fn install(&self, package: &[String]) -> Vec<Command>;
 
-
     /// Generates commands to change the primary mirror repository.
     fn change_mirror(&self, repo: &str, osinfo: Option<&Info>) -> Vec<Command>;
 
@@ -42,7 +40,6 @@ pub fn all_managers() -> Vec<Box<dyn PackageManager>> {
     ]
 }
 
-
 pub fn select(manager: &str) -> Option<Box<dyn PackageManager>> {
     all_managers().into_iter().find(|pm| pm.name() == manager)
 }
diff --git a/workshop-engine/src/pm/apk.rs b/workshop-engine/src/pm/apk.rs
index 7a5d2c4..cc439f5 100644
--- a/workshop-engine/src/pm/apk.rs
+++ b/workshop-engine/src/pm/apk.rs
@@ -73,10 +73,8 @@ impl PackageManager for Apk {
             // Download and trust GPG key if provided
             if let Some(key_url) = &repo_cfg.key_url {
                 let mut cmd = Command::new("sh");
-                cmd.arg("-c").arg(format!(
-                    "wget -qO- '{}' | apk keys --stdin",
-                    key_url
-                ));
+                cmd.arg("-c")
+                    .arg(format!("wget -qO- '{}' | apk keys --stdin", key_url));
                 cmds.push(cmd);
             }
 
@@ -87,10 +85,8 @@ impl PackageManager for Apk {
                 format!("{}\n", repo_cfg.url)
             };
             let mut cmd = Command::new("sh");
-            cmd.arg("-c").arg(format!(
-                "echo '{}' >> /etc/apk/repositories",
-                line.trim()
-            ));
+            cmd.arg("-c")
+                .arg(format!("echo '{}' >> /etc/apk/repositories", line.trim()));
             cmds.push(cmd);
         }
 
@@ -206,9 +202,7 @@ mod tests {
                     ),
                     (
                         serde_yaml::Value::String("key_url".to_string()),
-                        serde_yaml::Value::String(
-                            "https://example.com/alpine-key".to_string(),
-                        ),
+                        serde_yaml::Value::String("https://example.com/alpine-key".to_string()),
                     ),
                 ]
                 .into_iter()
@@ -238,8 +232,7 @@ mod tests {
                     (
                         serde_yaml::Value::String("url".to_string()),
                         serde_yaml::Value::String(
-                            "https://dl-cdn.alpinelinux.org/alpine/v3.19/community"
-                                .to_string(),
+                            "https://dl-cdn.alpinelinux.org/alpine/v3.19/community".to_string(),
                         ),
                     ),
                     (
diff --git a/workshop-engine/src/pm/apt.rs b/workshop-engine/src/pm/apt.rs
index 02208ac..bbb54f4 100644
--- a/workshop-engine/src/pm/apt.rs
+++ b/workshop-engine/src/pm/apt.rs
@@ -209,9 +209,7 @@ fn extract_codename(info: Option<&Info>) -> Option<String> {
 
     // 2. Try to infer from version string
     match info.version() {
-        Version::Custom(v)
-            if !v.chars().next().map(|c| c.is_numeric()).unwrap_or(true)
-        => {
+        Version::Custom(v) if !v.chars().next().map(|c| c.is_numeric()).unwrap_or(true) => {
             // Some systems put codename in Custom field
             return Some(v.clone());
         }
@@ -296,9 +294,7 @@ mod tests {
                 [
                     (
                         serde_yaml::Value::String("url".to_string()),
-                        serde_yaml::Value::String(
-                            "https://repo.example.com/ubuntu".to_string(),
-                        ),
+                        serde_yaml::Value::String("https://repo.example.com/ubuntu".to_string()),
                     ),
                     (
                         serde_yaml::Value::String("distro".to_string()),
@@ -340,9 +336,7 @@ mod tests {
                 [
                     (
                         serde_yaml::Value::String("url".to_string()),
-                        serde_yaml::Value::String(
-                            "https://repo.example.com/ubuntu".to_string(),
-                        ),
+                        serde_yaml::Value::String("https://repo.example.com/ubuntu".to_string()),
                     ),
                     (
                         serde_yaml::Value::String("distro".to_string()),
@@ -350,9 +344,7 @@ mod tests {
                     ),
                     (
                         serde_yaml::Value::String("key_url".to_string()),
-                        serde_yaml::Value::String(
-                            "https://repo.example.com/key.gpg".to_string(),
-                        ),
+                        serde_yaml::Value::String("https://repo.example.com/key.gpg".to_string()),
                     ),
                 ]
                 .into_iter()
@@ -377,8 +369,14 @@ mod tests {
 
     #[test]
     fn test_sanitize_repo_name() {
-        assert_eq!(sanitize_repo_name("https://example.com/repo"), "example.com_repo");
-        assert_eq!(sanitize_repo_name("http://mirror.tuna.tsinghua.edu.cn/ubuntu"), "mirror.tuna.tsinghua.edu.cn_ubuntu");
+        assert_eq!(
+            sanitize_repo_name("https://example.com/repo"),
+            "example.com_repo"
+        );
+        assert_eq!(
+            sanitize_repo_name("http://mirror.tuna.tsinghua.edu.cn/ubuntu"),
+            "mirror.tuna.tsinghua.edu.cn_ubuntu"
+        );
         assert_eq!(sanitize_repo_name("ppa:user/name"), "user_name");
     }
 
@@ -401,9 +399,7 @@ mod tests {
             serde_yaml::Value::Mapping(
                 [(
                     serde_yaml::Value::String("url".to_string()),
-                    serde_yaml::Value::String(
-                        "https://repo.example.com/ubuntu".to_string(),
-                    ),
+                    serde_yaml::Value::String("https://repo.example.com/ubuntu".to_string()),
                 )]
                 .into_iter()
                 .collect(),
diff --git a/workshop-engine/src/pm/dnf.rs b/workshop-engine/src/pm/dnf.rs
index 18f5045..dc2ee86 100644
--- a/workshop-engine/src/pm/dnf.rs
+++ b/workshop-engine/src/pm/dnf.rs
@@ -96,17 +96,17 @@ impl PackageManager for Dnf {
 
                 // Download and import the GPG key
                 let mut key_cmd = Command::new("sh");
-                key_cmd.arg("-c").arg(format!(
-                    "rpm --import '{}'",
-                    gpgkey
-                ));
+                key_cmd.arg("-c").arg(format!("rpm --import '{}'", gpgkey));
                 cmds.push(key_cmd);
             } else {
                 content.push_str("gpgcheck=0\n");
             }
 
             // Write the .repo file
-            let repo_path = format!("/etc/yum.repos.d/{}.repo", sanitize_repo_name(&repo_cfg.name));
+            let repo_path = format!(
+                "/etc/yum.repos.d/{}.repo",
+                sanitize_repo_name(&repo_cfg.name)
+            );
             let mut cmd = Command::new("sh");
             cmd.arg("-c").arg(format!(
                 "cat > '{}' << 'DNF_EOF'\n{}DNF_EOF",
@@ -200,9 +200,7 @@ mod tests {
                     ),
                     (
                         serde_yaml::Value::String("baseurl".to_string()),
-                        serde_yaml::Value::String(
-                            "https://repo.example.com/fedora".to_string(),
-                        ),
+                        serde_yaml::Value::String("https://repo.example.com/fedora".to_string()),
                     ),
                 ]
                 .into_iter()
@@ -236,15 +234,11 @@ mod tests {
                     ),
                     (
                         serde_yaml::Value::String("baseurl".to_string()),
-                        serde_yaml::Value::String(
-                            "https://repo.example.com/fedora".to_string(),
-                        ),
+                        serde_yaml::Value::String("https://repo.example.com/fedora".to_string()),
                     ),
                     (
                         serde_yaml::Value::String("gpgkey".to_string()),
-                        serde_yaml::Value::String(
-                            "https://repo.example.com/gpg".to_string(),
-                        ),
+                        serde_yaml::Value::String("https://repo.example.com/gpg".to_string()),
                     ),
                 ]
                 .into_iter()
diff --git a/workshop-engine/src/pm/pacman.rs b/workshop-engine/src/pm/pacman.rs
index 901fa13..691ea35 100644
--- a/workshop-engine/src/pm/pacman.rs
+++ b/workshop-engine/src/pm/pacman.rs
@@ -77,7 +77,6 @@ impl PackageManager for Pacman {
         "pacman"
     }
 
-
     fn binary(&self) -> &'static str {
         "pacman"
     }
@@ -198,7 +197,6 @@ mod tests {
         assert_eq!(pacman.binary(), "pacman");
     }
 
-
     #[test]
     fn test_update_command_contents() {
         let cmds = Pacman.update();
diff --git a/workshop-engine/src/types.rs b/workshop-engine/src/types.rs
index 0f1c521..c1a77df 100644
--- a/workshop-engine/src/types.rs
+++ b/workshop-engine/src/types.rs
@@ -27,7 +27,6 @@ pub struct DeltaExecutionContext {
     pub timeout: Option<Duration>,
 }
 
-
 impl Default for ExecutionContext {
     fn default() -> Self {
         Self {
diff --git a/workshop-engine/src/upm.rs b/workshop-engine/src/upm.rs
index 49d0d18..b1d0979 100644
--- a/workshop-engine/src/upm.rs
+++ b/workshop-engine/src/upm.rs
@@ -47,7 +47,12 @@ pub trait UserPackageManager {
 
 /// Returns a list of all available user package managers.
 pub fn all_managers() -> Vec<Box<dyn UserPackageManager>> {
-    vec![Box::new(rust::Rust), Box::new(python::Python), Box::new(go::Go), Box::new(custom::Custom)]
+    vec![
+        Box::new(rust::Rust),
+        Box::new(python::Python),
+        Box::new(go::Go),
+        Box::new(custom::Custom),
+    ]
 }
 
 /// Selects a user package manager by name.
diff --git a/workshop-engine/src/upm/go.rs b/workshop-engine/src/upm/go.rs
index d92717d..3f25a7d 100644
--- a/workshop-engine/src/upm/go.rs
+++ b/workshop-engine/src/upm/go.rs
@@ -84,11 +84,7 @@ impl UserPackageManager for Go {
         for mod_path in &cfg.modules {
             let dir = mod_path.parent().unwrap_or(mod_path);
             let cmd = "go mod download".to_string();
-            log::info!(
-                "Go UPM executing: cd {} && {}",
-                dir.display(),
-                cmd
-            );
+            log::info!("Go UPM executing: cd {} && {}", dir.display(), cmd);
 
             let cd_delta = DeltaExecutionContext {
                 working_dir: Some(dir.to_path_buf()),
@@ -166,7 +162,10 @@ env:
 "#;
         let cfg: GoConfig = serde_yaml::from_str(yaml).unwrap();
         assert_eq!(cfg.proxy.as_deref(), Some("https://goproxy.cn,direct"));
-        assert_eq!(cfg.packages, vec!["honnef.co/go/tools/cmd/staticcheck@latest"]);
+        assert_eq!(
+            cfg.packages,
+            vec!["honnef.co/go/tools/cmd/staticcheck@latest"]
+        );
         assert_eq!(cfg.modules, vec![PathBuf::from("/workspace/server/go.mod")]);
         assert_eq!(
             cfg.env_.get("GOMODCACHE").and_then(|v| v.as_deref()),
diff --git a/workshop-engine/src/upm/python.rs b/workshop-engine/src/upm/python.rs
index 6a8617c..52de6ca 100644
--- a/workshop-engine/src/upm/python.rs
+++ b/workshop-engine/src/upm/python.rs
@@ -123,11 +123,10 @@ impl UserPackageManager for Python {
         ctx: &ExecutionContext,
         event_tx: &EventSender,
     ) -> Result<(), DependencyError> {
-        let cfg: PythonConfig =
-            serde_yaml::from_value(config.clone()).map_err(|e| {
-                log::error!("Failed to parse user.python config: {}", e);
-                DependencyError::ParseError()
-            })?;
+        let cfg: PythonConfig = serde_yaml::from_value(config.clone()).map_err(|e| {
+            log::error!("Failed to parse user.python config: {}", e);
+            DependencyError::ParseError()
+        })?;
 
         let engine = Engine::new();
 
@@ -152,8 +151,7 @@ impl Python {
 
         // ── 1. venv ──────────────────────────────────────────────
         if let Some(ref dir) = action.directory {
-            let venv_cmd =
-                format!("{} -m venv '{}'", python_bin(action), dir.display());
+            let venv_cmd = format!("{} -m venv '{}'", python_bin(action), dir.display());
             log::info!("Python UPM creating venv: {}", venv_cmd);
             let r = engine
                 .execute_command_with_delta(&venv_cmd, ctx, event_tx, &delta)
diff --git a/workshop-engine/src/upm/rust.rs b/workshop-engine/src/upm/rust.rs
index e180ff0..aea5f86 100644
--- a/workshop-engine/src/upm/rust.rs
+++ b/workshop-engine/src/upm/rust.rs
@@ -1,10 +1,10 @@
+use crate::error::DependencyError;
+use crate::types::{DeltaExecutionContext, Engine, EventSender, ExecutionContext};
+use crate::upm::UPMSysDeps;
 use async_trait::async_trait;
 use serde::Deserialize;
 use std::collections::HashMap;
 use std::path::PathBuf;
-use crate::error::DependencyError;
-use crate::types::{DeltaExecutionContext, Engine, EventSender, ExecutionContext};
-use crate::upm::UPMSysDeps;
 
 use super::UserPackageManager;
 
@@ -67,7 +67,9 @@ struct RustConfig {
     cargo: CargoSubConfig,
 }
 
-fn default_rust_type() -> String { "rustup".to_string() }
+fn default_rust_type() -> String {
+    "rustup".to_string()
+}
 
 // ── Cargo sub-config ───────────────────────────────────────────────
 
@@ -134,18 +136,12 @@ impl UserPackageManager for Rust {
 
         // ── 2. rustup component add <comp…> ──────────────────────
         if !cfg.components.is_empty() {
-            commands.push(format!(
-                "rustup component add {}",
-                cfg.components.join(" ")
-            ));
+            commands.push(format!("rustup component add {}", cfg.components.join(" ")));
         }
 
         // ── 3. rustup target add <target…> ───────────────────────
         if !cfg.targets.is_empty() {
-            commands.push(format!(
-                "rustup target add {}",
-                cfg.targets.join(" ")
-            ));
+            commands.push(format!("rustup target add {}", cfg.targets.join(" ")));
         }
 
         // ── 4. cargo fetch ───────────────────────────────────────
@@ -161,11 +157,7 @@ impl UserPackageManager for Rust {
             }
             for manifest in &cargo.manifests {
                 // Host target (no --target)
-                commands.push(format!(
-                    "{} --manifest-path '{}'",
-                    base,
-                    manifest.display()
-                ));
+                commands.push(format!("{} --manifest-path '{}'", base, manifest.display()));
                 // Cross-compilation targets
                 for target in &cfg.targets {
                     commands.push(format!(