feat: Add weevil uninstall command

Adds `weevil uninstall` with three modes of operation:
- Full uninstall removes the entire .weevil directory
- --dry-run enumerates managed components and their sizes
- --only N removes specific components by index

Acknowledges system-installed dependencies (Android SDK, Gradle)
in dry-run output so users know what will and won't be touched.

src/commands/doctor.rs

@@ -0,0 +1,267 @@
+use anyhow::Result;
+use std::path::Path;
+use std::process::Command;
+use colored::*;
+
+use crate::sdk::SdkConfig;
+
+#[derive(Debug)]
+pub struct SystemHealth {
+    pub java_ok: bool,
+    pub java_version: Option<String>,
+    pub ftc_sdk_ok: bool,
+    pub ftc_sdk_version: Option<String>,
+    pub android_sdk_ok: bool,
+    pub adb_ok: bool,
+    pub adb_version: Option<String>,
+    pub gradle_ok: bool,
+    pub gradle_version: Option<String>,
+}
+
+impl SystemHealth {
+    pub fn is_healthy(&self) -> bool {
+        // Required: Java, FTC SDK, Android SDK
+        // Optional: ADB in PATH (can be in Android SDK), Gradle (projects have wrapper)
+        self.java_ok && self.ftc_sdk_ok && self.android_sdk_ok
+    }
+}
+
+/// Run system diagnostics and report health status
+pub fn run_diagnostics() -> Result<()> {
+    println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+    println!("{}", "   🩺 Weevil Doctor - System Diagnostics".bright_cyan().bold());
+    println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+    println!();
+    
+    let health = check_system_health()?;
+    print_diagnostics(&health);
+    
+    println!();
+    println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+    
+    if health.is_healthy() {
+        println!("{}", "   ✓ System is healthy and ready for FTC development".bright_green().bold());
+        println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+        println!();
+        println!("{}", "You can now:".bright_yellow().bold());
+        println!("  - Create a new project: {}", "weevil new <project-name>".bright_cyan());
+        println!("  - Setup a cloned project: {}", "weevil setup <project-path>".bright_cyan());
+    } else {
+        println!("{}", "   ⚠ Issues found - setup required".bright_yellow().bold());
+        println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+        println!();
+        println!("{}", "To fix issues, run:".bright_yellow().bold());
+        println!("  {}", "weevil setup".bright_cyan());
+    }
+    
+    println!();
+    
+    Ok(())
+}
+
+/// Check system health and return a report
+pub fn check_system_health() -> Result<SystemHealth> {
+    let sdk_config = SdkConfig::new()?;
+    
+    // Check Java
+    let (java_ok, java_version) = match check_java() {
+        Ok(version) => (true, Some(version)),
+        Err(_) => (false, None),
+    };
+    
+    // Check FTC SDK
+    let (ftc_sdk_ok, ftc_sdk_version) = if sdk_config.ftc_sdk_path.exists() {
+        match crate::sdk::ftc::verify(&sdk_config.ftc_sdk_path) {
+            Ok(_) => {
+                let version = crate::sdk::ftc::get_version(&sdk_config.ftc_sdk_path)
+                    .unwrap_or_else(|_| "unknown".to_string());
+                (true, Some(version))
+            }
+            Err(_) => (false, None),
+        }
+    } else {
+        (false, None)
+    };
+    
+    // Check Android SDK
+    let android_sdk_ok = if sdk_config.android_sdk_path.exists() {
+        crate::sdk::android::verify(&sdk_config.android_sdk_path).is_ok()
+    } else {
+        false
+    };
+    
+    // Check ADB
+    let (adb_ok, adb_version) = match check_adb(&sdk_config.android_sdk_path) {
+        Ok(version) => (true, Some(version)),
+        Err(_) => (false, None),
+    };
+    
+    // Check Gradle (optional)
+    let (gradle_ok, gradle_version) = match check_gradle() {
+        Ok(version) => (true, Some(version)),
+        Err(_) => (false, None),
+    };
+    
+    Ok(SystemHealth {
+        java_ok,
+        java_version,
+        ftc_sdk_ok,
+        ftc_sdk_version,
+        android_sdk_ok,
+        adb_ok,
+        adb_version,
+        gradle_ok,
+        gradle_version,
+    })
+}
+
+fn print_diagnostics(health: &SystemHealth) {
+    let sdk_config = SdkConfig::new().unwrap();
+    
+    println!("{}", "Required Components:".bright_yellow().bold());
+    println!();
+    
+    // Java
+    if health.java_ok {
+        println!("  {} Java JDK {}", 
+            "✓".green(), 
+            health.java_version.as_ref().unwrap()
+        );
+    } else {
+        println!("  {} Java JDK {}", 
+            "✗".red(), 
+            "not found".red()
+        );
+    }
+    
+    // FTC SDK
+    if health.ftc_sdk_ok {
+        println!("  {} FTC SDK {} at {}", 
+            "✓".green(),
+            health.ftc_sdk_version.as_ref().unwrap(),
+            sdk_config.ftc_sdk_path.display()
+        );
+    } else {
+        println!("  {} FTC SDK {} (expected at {})", 
+            "✗".red(),
+            "not found".red(),
+            sdk_config.ftc_sdk_path.display()
+        );
+    }
+    
+    // Android SDK
+    if health.android_sdk_ok {
+        println!("  {} Android SDK at {}", 
+            "✓".green(),
+            sdk_config.android_sdk_path.display()
+        );
+    } else {
+        println!("  {} Android SDK {} (expected at {})", 
+            "✗".red(),
+            "not found".red(),
+            sdk_config.android_sdk_path.display()
+        );
+    }
+    
+    println!();
+    println!("{}", "Optional Components:".bright_yellow().bold());
+    println!();
+    
+    // ADB
+    if health.adb_ok {
+        println!("  {} ADB {}", 
+            "✓".green(),
+            health.adb_version.as_ref().unwrap()
+        );
+    } else {
+        println!("  {} ADB {}", 
+            "⚠".yellow(),
+            "not in PATH (included in Android SDK)".yellow()
+        );
+    }
+    
+    // Gradle
+    if health.gradle_ok {
+        println!("  {} Gradle {}", 
+            "✓".green(),
+            health.gradle_version.as_ref().unwrap()
+        );
+    } else {
+        println!("  {} Gradle {}", 
+            "⚠".yellow(),
+            "not in PATH (projects include wrapper)".yellow()
+        );
+    }
+}
+
+fn check_java() -> Result<String> {
+    let output = Command::new("java")
+        .arg("-version")
+        .output();
+    
+    match output {
+        Ok(out) => {
+            let stderr = String::from_utf8_lossy(&out.stderr);
+            for line in stderr.lines() {
+                if line.contains("version") {
+                    if let Some(version_str) = line.split('"').nth(1) {
+                        return Ok(version_str.to_string());
+                    }
+                }
+            }
+            Ok("installed (version unknown)".to_string())
+        }
+        Err(_) => anyhow::bail!("Java JDK not found in PATH"),
+    }
+}
+
+fn check_adb(android_sdk_path: &Path) -> Result<String> {
+    // First try system PATH
+    let output = Command::new("adb")
+        .arg("version")
+        .output();
+    
+    if let Ok(out) = output {
+        if out.status.success() {
+            let stdout = String::from_utf8_lossy(&out.stdout);
+            for line in stdout.lines() {
+                if line.starts_with("Android Debug Bridge version") {
+                    return Ok(line.replace("Android Debug Bridge version ", ""));
+                }
+            }
+            return Ok("installed (version unknown)".to_string());
+        }
+    }
+    
+    // Try Android SDK location
+    let adb_path = if cfg!(target_os = "windows") {
+        android_sdk_path.join("platform-tools").join("adb.exe")
+    } else {
+        android_sdk_path.join("platform-tools").join("adb")
+    };
+    
+    if adb_path.exists() {
+        anyhow::bail!("ADB found in Android SDK but not in PATH")
+    } else {
+        anyhow::bail!("ADB not found")
+    }
+}
+
+fn check_gradle() -> Result<String> {
+    let output = Command::new("gradle")
+        .arg("--version")
+        .output();
+    
+    match output {
+        Ok(out) => {
+            let stdout = String::from_utf8_lossy(&out.stdout);
+            for line in stdout.lines() {
+                if line.starts_with("Gradle") {
+                    return Ok(line.replace("Gradle ", ""));
+                }
+            }
+            Ok("installed (version unknown)".to_string())
+        }
+        Err(_) => anyhow::bail!("Gradle not found in PATH"),
+    }
+}

src/commands/mod.rs

@@ -3,3 +3,6 @@ pub mod upgrade;
 pub mod deploy;
 pub mod sdk;
 pub mod config;
+pub mod setup;
+pub mod doctor;
+pub mod uninstall;

src/commands/new.rs

@@ -34,14 +34,47 @@ pub fn create_project(
     println!("{}", format!("Creating FTC project: {}", name).bright_green().bold());
     println!();
     
+    // Check system health FIRST
+    println!("{}", "Checking system prerequisites...".bright_yellow());
+    let health = crate::commands::doctor::check_system_health()?;
+    
+    if !health.is_healthy() {
+        println!();
+        println!("{}", "═══════════════════════════════════════════════════════════".bright_red());
+        println!("{}", "   ✗ System Setup Required".bright_red().bold());
+        println!("{}", "═══════════════════════════════════════════════════════════".bright_red());
+        println!();
+        println!("{}", "Missing required components:".bright_yellow().bold());
+        
+        if !health.java_ok {
+            println!("  {} Java JDK", "✗".red());
+        }
+        if !health.ftc_sdk_ok {
+            println!("  {} FTC SDK", "✗".red());
+        }
+        if !health.android_sdk_ok {
+            println!("  {} Android SDK", "✗".red());
+        }
+        
+        println!();
+        println!("{}", "Before creating a project, you need to set up your development environment.".bright_yellow());
+        println!();
+        println!("{}", "Run this command to install required components:".bright_yellow().bold());
+        println!("  {}", "weevil setup".bright_cyan());
+        println!();
+        println!("{}", "Then try creating your project again:".bright_yellow().bold());
+        println!("  {}", format!("weevil new {}", name).bright_cyan());
+        println!();
+        
+        bail!("System setup required");
+    }
+    
+    println!("{} All prerequisites met", "✓".green());
+    println!();
+    
     // Setup or verify SDK configuration
     let sdk_config = SdkConfig::with_paths(ftc_sdk, android_sdk)?;
     
-    // Install SDKs if needed
-    println!("{}", "Checking SDKs...".bright_yellow());
-    ensure_sdks(&sdk_config)?;
-    
-    println!();
     println!("{}", "Creating project structure...".bright_yellow());
     
     // Build the project
@@ -57,34 +90,12 @@ pub fn create_project(
     println!("Version: {}", crate::sdk::ftc::get_version(&sdk_config.ftc_sdk_path).unwrap_or_else(|_| "unknown".to_string()));
     println!();
     println!("{}", "Next steps:".bright_yellow().bold());
-    println!("  1. cd {}", name);
+    println!("  1. {}", format!("cd {}", name).bright_cyan());
     println!("  2. Review README.md for project structure");
     println!("  3. Start coding in src/main/java/robot/");
-    println!("  4. Run: ./gradlew test");
-    println!("  5. Deploy: weevil deploy {}", name);
+    println!("  4. Run tests: {}", "./gradlew test".bright_cyan());
+    println!("  5. Deploy to robot: {}", format!("weevil deploy {}", name).bright_cyan());
     println!();
     
     Ok(())
 }
-
-fn ensure_sdks(config: &SdkConfig) -> Result<()> {
-    // Check FTC SDK
-    if !config.ftc_sdk_path.exists() {
-        println!("FTC SDK not found. Installing...");
-        crate::sdk::ftc::install(&config.ftc_sdk_path, &config.android_sdk_path)?;
-    } else {
-        println!("{} FTC SDK found at: {}", "✓".green(), config.ftc_sdk_path.display());
-        crate::sdk::ftc::verify(&config.ftc_sdk_path)?;
-    }
-    
-    // Check Android SDK
-    if !config.android_sdk_path.exists() {
-        println!("Android SDK not found. Installing...");
-        crate::sdk::android::install(&config.android_sdk_path)?;
-    } else {
-        println!("{} Android SDK found at: {}", "✓".green(), config.android_sdk_path.display());
-        crate::sdk::android::verify(&config.android_sdk_path)?;
-    }
-    
-    Ok(())
-}

src/commands/setup.rs

@@ -0,0 +1,514 @@
+use anyhow::{Result, Context, bail};
+use std::path::{Path, PathBuf};
+use std::process::Command;
+use colored::*;
+
+use crate::sdk::SdkConfig;
+use crate::project::ProjectConfig;
+
+/// Setup development environment - either system-wide or for a specific project
+pub fn setup_environment(project_path: Option<&str>) -> Result<()> {
+    match project_path {
+        Some(path) => setup_project(path),
+        None => setup_system(),
+    }
+}
+
+/// Setup system-wide development environment with default SDKs
+fn setup_system() -> Result<()> {
+    println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+    println!("{}", "   System Setup - Preparing FTC Development Environment".bright_cyan().bold());
+    println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+    println!();
+    
+    let mut issues = Vec::new();
+    let mut installed = Vec::new();
+    
+    // Check and install SDKs
+    let sdk_config = SdkConfig::new()?;
+    
+    // 1. Check Java
+    println!("{}", "Checking Java JDK...".bright_yellow());
+    match check_java() {
+        Ok(version) => {
+            println!("{} Java JDK {} found", "✓".green(), version);
+            installed.push(format!("Java JDK {}", version));
+        }
+        Err(e) => {
+            println!("{} {}", "✗".red(), e);
+            issues.push(("Java JDK", get_java_install_instructions()));
+        }
+    }
+    println!();
+    
+    // 2. Check/Install FTC SDK
+    println!("{}", "Checking FTC SDK...".bright_yellow());
+    if sdk_config.ftc_sdk_path.exists() {
+        match crate::sdk::ftc::verify(&sdk_config.ftc_sdk_path) {
+            Ok(_) => {
+                let version = crate::sdk::ftc::get_version(&sdk_config.ftc_sdk_path)
+                    .unwrap_or_else(|_| "unknown".to_string());
+                println!("{} FTC SDK {} found at: {}", 
+                    "✓".green(), 
+                    version,
+                    sdk_config.ftc_sdk_path.display()
+                );
+                installed.push(format!("FTC SDK {}", version));
+            }
+            Err(_) => {
+                println!("{} FTC SDK found but incomplete, reinstalling...", "⚠".yellow());
+                crate::sdk::ftc::install(&sdk_config.ftc_sdk_path, &sdk_config.android_sdk_path)?;
+                let version = crate::sdk::ftc::get_version(&sdk_config.ftc_sdk_path)
+                    .unwrap_or_else(|_| "unknown".to_string());
+                installed.push(format!("FTC SDK {} (installed)", version));
+            }
+        }
+    } else {
+        println!("FTC SDK not found. Installing...");
+        crate::sdk::ftc::install(&sdk_config.ftc_sdk_path, &sdk_config.android_sdk_path)?;
+        let version = crate::sdk::ftc::get_version(&sdk_config.ftc_sdk_path)
+            .unwrap_or_else(|_| "unknown".to_string());
+        installed.push(format!("FTC SDK {} (installed)", version));
+    }
+    println!();
+    
+    // 3. Check/Install Android SDK
+    println!("{}", "Checking Android SDK...".bright_yellow());
+    if sdk_config.android_sdk_path.exists() {
+        match crate::sdk::android::verify(&sdk_config.android_sdk_path) {
+            Ok(_) => {
+                println!("{} Android SDK found at: {}", 
+                    "✓".green(), 
+                    sdk_config.android_sdk_path.display()
+                );
+                installed.push("Android SDK".to_string());
+            }
+            Err(_) => {
+                println!("{} Android SDK found but incomplete, reinstalling...", "⚠".yellow());
+                crate::sdk::android::install(&sdk_config.android_sdk_path)?;
+                installed.push("Android SDK (installed)".to_string());
+            }
+        }
+    } else {
+        println!("Android SDK not found. Installing...");
+        crate::sdk::android::install(&sdk_config.android_sdk_path)?;
+        installed.push("Android SDK (installed)".to_string());
+    }
+    println!();
+    
+    // 4. Check ADB
+    println!("{}", "Checking ADB (Android Debug Bridge)...".bright_yellow());
+    match check_adb(&sdk_config.android_sdk_path) {
+        Ok(version) => {
+            println!("{} ADB {} found", "✓".green(), version);
+            installed.push(format!("ADB {}", version));
+        }
+        Err(e) => {
+            println!("{} {}", "⚠".yellow(), e);
+            println!("  ADB is included in Android SDK platform-tools");
+            println!("  Add to PATH: {}", sdk_config.android_sdk_path.join("platform-tools").display());
+        }
+    }
+    println!();
+    
+    // 5. Check Gradle
+    println!("{}", "Checking Gradle...".bright_yellow());
+    match check_gradle() {
+        Ok(version) => {
+            println!("{} Gradle {} found", "✓".green(), version);
+            installed.push(format!("Gradle {}", version));
+        }
+        Err(e) => {
+            println!("{} {}", "⚠".yellow(), e);
+            println!("  Note: Weevil projects include Gradle wrapper, so this is optional");
+        }
+    }
+    println!();
+    
+    // Print summary
+    print_system_summary(&installed, &issues, &sdk_config);
+    
+    Ok(())
+}
+
+/// Setup dependencies for a specific project by reading its .weevil.toml
+fn setup_project(project_path: &str) -> Result<()> {
+    let project_path = PathBuf::from(project_path);
+    
+    if !project_path.exists() {
+        bail!("Project directory not found: {}", project_path.display());
+    }
+    
+    println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+    println!("{}", "   Project Setup - Installing Dependencies".bright_cyan().bold());
+    println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+    println!();
+    
+    // Load project configuration
+    println!("{}", "Reading project configuration...".bright_yellow());
+    let config = ProjectConfig::load(&project_path)
+        .context("Failed to load .weevil.toml")?;
+    
+    println!();
+    println!("{}", "Project Configuration:".bright_yellow().bold());
+    println!("  Project: {}", config.project_name.bright_white());
+    println!("  FTC SDK: {} ({})", 
+        config.ftc_sdk_version.bright_white(),
+        config.ftc_sdk_path.display()
+    );
+    println!("  Android SDK: {}", config.android_sdk_path.display());
+    println!();
+    
+    let mut installed = Vec::new();
+    let mut issues = Vec::new();
+    
+    // 1. Check Java
+    println!("{}", "Checking Java JDK...".bright_yellow());
+    match check_java() {
+        Ok(version) => {
+            println!("{} Java JDK {} found", "✓".green(), version);
+            installed.push(format!("Java JDK {}", version));
+        }
+        Err(e) => {
+            println!("{} {}", "✗".red(), e);
+            issues.push(("Java JDK", get_java_install_instructions()));
+        }
+    }
+    println!();
+    
+    // 2. Check/Install project-specific FTC SDK
+    println!("{}", format!("Checking FTC SDK {}...", config.ftc_sdk_version).bright_yellow());
+    if config.ftc_sdk_path.exists() {
+        match crate::sdk::ftc::verify(&config.ftc_sdk_path) {
+            Ok(_) => {
+                println!("{} FTC SDK {} found at: {}", 
+                    "✓".green(), 
+                    config.ftc_sdk_version,
+                    config.ftc_sdk_path.display()
+                );
+                installed.push(format!("FTC SDK {}", config.ftc_sdk_version));
+            }
+            Err(_) => {
+                println!("{} FTC SDK path exists but is invalid", "✗".red());
+                println!("  Expected at: {}", config.ftc_sdk_path.display());
+                println!();
+                println!("{}", "Solution:".bright_yellow().bold());
+                println!("  The .weevil.toml specifies an FTC SDK location that doesn't exist or is incomplete.");
+                println!("  You have two options:");
+                println!();
+                println!("  1. Update the project to use a different SDK:");
+                println!("     weevil config {} --set-sdk <path-to-sdk>", project_path.display());
+                println!();
+                println!("  2. Install the SDK at the expected location:");
+                println!("     # Clone FTC SDK to the expected path");
+                println!("     git clone https://github.com/FIRST-Tech-Challenge/FtcRobotController.git \\");
+                println!("               {}", config.ftc_sdk_path.display());
+                println!("     cd {}", config.ftc_sdk_path.display());
+                println!("     git checkout {}", config.ftc_sdk_version);
+                bail!("FTC SDK verification failed");
+            }
+        }
+    } else {
+        println!("{} FTC SDK not found at: {}", "✗".red(), config.ftc_sdk_path.display());
+        println!();
+        
+        // Try to install it automatically
+        println!("{}", "Attempting automatic installation...".bright_yellow());
+        match crate::sdk::ftc::install(&config.ftc_sdk_path, &config.android_sdk_path) {
+            Ok(_) => {
+                println!("{} FTC SDK {} installed successfully", 
+                    "✓".green(), 
+                    config.ftc_sdk_version
+                );
+                installed.push(format!("FTC SDK {} (installed)", config.ftc_sdk_version));
+            }
+            Err(e) => {
+                println!("{} Automatic installation failed: {}", "✗".red(), e);
+                println!();
+                println!("{}", "Manual Installation Required:".bright_yellow().bold());
+                println!("  git clone https://github.com/FIRST-Tech-Challenge/FtcRobotController.git \\");
+                println!("            {}", config.ftc_sdk_path.display());
+                println!("  cd {}", config.ftc_sdk_path.display());
+                println!("  git checkout {}", config.ftc_sdk_version);
+                bail!("FTC SDK installation failed");
+            }
+        }
+    }
+    println!();
+    
+    // 3. Check/Install Android SDK
+    println!("{}", "Checking Android SDK...".bright_yellow());
+    if config.android_sdk_path.exists() {
+        match crate::sdk::android::verify(&config.android_sdk_path) {
+            Ok(_) => {
+                println!("{} Android SDK found at: {}", 
+                    "✓".green(), 
+                    config.android_sdk_path.display()
+                );
+                installed.push("Android SDK".to_string());
+            }
+            Err(_) => {
+                println!("{} Android SDK found but incomplete, reinstalling...", "⚠".yellow());
+                crate::sdk::android::install(&config.android_sdk_path)?;
+                installed.push("Android SDK (installed)".to_string());
+            }
+        }
+    } else {
+        println!("Android SDK not found. Installing...");
+        crate::sdk::android::install(&config.android_sdk_path)?;
+        installed.push("Android SDK (installed)".to_string());
+    }
+    println!();
+    
+    // 4. Check ADB
+    println!("{}", "Checking ADB...".bright_yellow());
+    match check_adb(&config.android_sdk_path) {
+        Ok(version) => {
+            println!("{} ADB {} found", "✓".green(), version);
+            installed.push(format!("ADB {}", version));
+        }
+        Err(e) => {
+            println!("{} {}", "⚠".yellow(), e);
+            println!("  Add to PATH: {}", config.android_sdk_path.join("platform-tools").display());
+        }
+    }
+    println!();
+    
+    // 5. Check Gradle wrapper in project
+    println!("{}", "Checking Gradle wrapper...".bright_yellow());
+    let gradlew = if cfg!(target_os = "windows") {
+        project_path.join("gradlew.bat")
+    } else {
+        project_path.join("gradlew")
+    };
+    
+    if gradlew.exists() {
+        println!("{} Gradle wrapper found in project", "✓".green());
+        installed.push("Gradle wrapper".to_string());
+    } else {
+        println!("{} Gradle wrapper not found in project", "⚠".yellow());
+        println!("  Run 'weevil upgrade {}' to regenerate project files", project_path.display());
+    }
+    println!();
+    
+    // Print summary
+    print_project_summary(&installed, &issues, &config, &project_path);
+    
+    Ok(())
+}
+
+fn check_java() -> Result<String> {
+    let output = Command::new("java")
+        .arg("-version")
+        .output();
+    
+    match output {
+        Ok(out) => {
+            let stderr = String::from_utf8_lossy(&out.stderr);
+            // Java version is typically in stderr, format: java version "11.0.x" or openjdk version "11.0.x"
+            for line in stderr.lines() {
+                if line.contains("version") {
+                    if let Some(version_str) = line.split('"').nth(1) {
+                        return Ok(version_str.to_string());
+                    }
+                }
+            }
+            Ok("installed (version unknown)".to_string())
+        }
+        Err(_) => bail!("Java JDK not found in PATH"),
+    }
+}
+
+fn check_adb(android_sdk_path: &Path) -> Result<String> {
+    // First try system PATH
+    let output = Command::new("adb")
+        .arg("version")
+        .output();
+    
+    if let Ok(out) = output {
+        if out.status.success() {
+            let stdout = String::from_utf8_lossy(&out.stdout);
+            for line in stdout.lines() {
+                if line.starts_with("Android Debug Bridge version") {
+                    return Ok(line.replace("Android Debug Bridge version ", ""));
+                }
+            }
+            return Ok("installed (version unknown)".to_string());
+        }
+    }
+    
+    // Try Android SDK location
+    let adb_path = if cfg!(target_os = "windows") {
+        android_sdk_path.join("platform-tools").join("adb.exe")
+    } else {
+        android_sdk_path.join("platform-tools").join("adb")
+    };
+    
+    if adb_path.exists() {
+        bail!("ADB found in Android SDK but not in PATH")
+    } else {
+        bail!("ADB not found")
+    }
+}
+
+fn check_gradle() -> Result<String> {
+    let output = Command::new("gradle")
+        .arg("--version")
+        .output();
+    
+    match output {
+        Ok(out) => {
+            let stdout = String::from_utf8_lossy(&out.stdout);
+            for line in stdout.lines() {
+                if line.starts_with("Gradle") {
+                    return Ok(line.replace("Gradle ", ""));
+                }
+            }
+            Ok("installed (version unknown)".to_string())
+        }
+        Err(_) => bail!("Gradle not found in PATH (optional)"),
+    }
+}
+
+fn get_java_install_instructions() -> String {
+    if cfg!(target_os = "windows") {
+        format!(
+            "Java JDK is required but not found.\n\
+             \n\
+             To install Java 11 on Windows:\n\
+             \n\
+             1. Download from: {}\n\
+             2. Run the installer\n\
+             3. Add Java to your PATH (installer usually does this)\n\
+             4. Run 'weevil setup' again to verify\n\
+             \n\
+             Verify installation: java -version",
+            "https://adoptium.net/temurin/releases/?version=11".bright_white()
+        )
+    } else if cfg!(target_os = "macos") {
+        format!(
+            "Java JDK is required but not found.\n\
+             \n\
+             To install Java 11 on macOS:\n\
+             \n\
+             Using Homebrew (recommended):\n\
+             {}\n\
+             \n\
+             Or download from: {}\n\
+             \n\
+             Verify installation: java -version",
+            "  brew install openjdk@11".bright_white(),
+            "https://adoptium.net/temurin/releases/?version=11".bright_white()
+        )
+    } else {
+        format!(
+            "Java JDK is required but not found.\n\
+             \n\
+             To install Java 11 on Ubuntu/Debian:\n\
+             {}\n\
+             {}\n\
+             \n\
+             To install on Fedora/RHEL:\n\
+             {}\n\
+             \n\
+             Verify installation: java -version",
+            "  sudo apt update".bright_white(),
+            "  sudo apt install openjdk-11-jdk".bright_white(),
+            "  sudo dnf install java-11-openjdk-devel".bright_white()
+        )
+    }
+}
+
+fn print_system_summary(installed: &[String], issues: &[(&str, String)], sdk_config: &SdkConfig) {
+    println!("{}", "═══════════════════════════════════════════════════════════".bright_green());
+    println!("{}", "   System Setup Summary".bright_green().bold());
+    println!("{}", "═══════════════════════════════════════════════════════════".bright_green());
+    println!();
+    
+    if !installed.is_empty() {
+        println!("{}", "Installed Components:".bright_green().bold());
+        for component in installed {
+            println!("  {} {}", "✓".green(), component);
+        }
+        println!();
+    }
+    
+    if !issues.is_empty() {
+        println!("{}", "Manual Installation Required:".bright_yellow().bold());
+        println!();
+        for (name, instructions) in issues {
+            println!("{} {}", "✗".red(), name.red().bold());
+            println!();
+            for line in instructions.lines() {
+                println!("  {}", line);
+            }
+            println!();
+        }
+    }
+    
+    println!("{}", "SDK Locations:".bright_cyan().bold());
+    println!("  FTC SDK:     {}", sdk_config.ftc_sdk_path.display());
+    println!("  Android SDK: {}", sdk_config.android_sdk_path.display());
+    println!("  Cache:       {}", sdk_config.cache_dir.display());
+    println!();
+    
+    if issues.is_empty() {
+        println!("{}", "✓ System is ready for FTC development!".bright_green().bold());
+        println!();
+        println!("{}", "Next steps:".bright_yellow().bold());
+        println!("  Create a new project:    {}", "weevil new my-robot".bright_white());
+        println!("  Clone existing project:  {}", "git clone <repo> && cd <repo> && weevil setup .".bright_white());
+    } else {
+        println!("{}", "⚠ Please install the required components listed above".bright_yellow().bold());
+        println!("  Then run {} to verify", "weevil setup".bright_white());
+    }
+    println!();
+}
+
+fn print_project_summary(installed: &[String], issues: &[(&str, String)], config: &ProjectConfig, project_path: &Path) {
+    println!("{}", "═══════════════════════════════════════════════════════════".bright_green());
+    println!("{}", "   Project Setup Summary".bright_green().bold());
+    println!("{}", "═══════════════════════════════════════════════════════════".bright_green());
+    println!();
+    
+    println!("{}", "Project Details:".bright_cyan().bold());
+    println!("  Name:        {}", config.project_name);
+    println!("  Location:    {}", project_path.display());
+    println!("  FTC SDK:     {} at {}", config.ftc_sdk_version, config.ftc_sdk_path.display());
+    println!();
+    
+    if !installed.is_empty() {
+        println!("{}", "Installed Components:".bright_green().bold());
+        for component in installed {
+            println!("  {} {}", "✓".green(), component);
+        }
+        println!();
+    }
+    
+    if !issues.is_empty() {
+        println!("{}", "Manual Installation Required:".bright_yellow().bold());
+        println!();
+        for (name, instructions) in issues {
+            println!("{} {}", "✗".red(), name.red().bold());
+            println!();
+            for line in instructions.lines() {
+                println!("  {}", line);
+            }
+            println!();
+        }
+    }
+    
+    if issues.is_empty() {
+        println!("{}", "✓ Project is ready for development!".bright_green().bold());
+        println!();
+        println!("{}", "Next steps:".bright_yellow().bold());
+        println!("  1. Review the code:      {}", format!("cd {}", project_path.display()).bright_white());
+        println!("  2. Run tests:            {}", "./gradlew test".bright_white());
+        println!("  3. Build:                {}", "./build.sh (or build.bat on Windows)".bright_white());
+        println!("  4. Deploy to robot:      {}", format!("weevil deploy {}", project_path.display()).bright_white());
+    } else {
+        println!("{}", "⚠ Please install the required components listed above".bright_yellow().bold());
+        println!("  Then run {} to verify", format!("weevil setup {}", project_path.display()).bright_white());
+    }
+    println!();
+}

src/commands/uninstall.rs

@@ -0,0 +1,393 @@
+use anyhow::Result;
+use std::fs;
+use std::io::{self, Write};
+use std::path::PathBuf;
+use colored::*;
+
+use crate::sdk::SdkConfig;
+
+#[derive(Debug, Clone)]
+enum RemoveTarget {
+    FtcSdk(PathBuf, String),   // path, version label
+    AndroidSdk(PathBuf),
+}
+
+impl RemoveTarget {
+    fn label(&self) -> String {
+        match self {
+            RemoveTarget::FtcSdk(_, version) => format!("FTC SDK {}", version),
+            RemoveTarget::AndroidSdk(_) => "Android SDK".to_string(),
+        }
+    }
+    
+    fn path(&self) -> &PathBuf {
+        match self {
+            RemoveTarget::FtcSdk(path, _) => path,
+            RemoveTarget::AndroidSdk(path) => path,
+        }
+    }
+    
+    fn size(&self) -> u64 {
+        dir_size(self.path())
+    }
+}
+
+/// Uninstall Weevil-managed dependencies
+/// 
+/// - No args: removes ~/.weevil entirely
+/// - --dry-run: shows what would be removed
+/// - --only N [N ...]: selective removal of specific components
+pub fn uninstall_dependencies(dry_run: bool, targets: Option<Vec<usize>>) -> Result<()> {
+    println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+    println!("{}", "   🗑️  Weevil Uninstall - Remove Dependencies".bright_cyan().bold());
+    println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+    println!();
+    
+    let sdk_config = SdkConfig::new()?;
+    
+    // No --only flag: full uninstall, just nuke .weevil
+    if targets.is_none() {
+        return full_uninstall(&sdk_config, dry_run);
+    }
+    
+    // --only flag: selective removal
+    let all_targets = scan_targets(&sdk_config);
+    
+    if all_targets.is_empty() {
+        println!("{}", "No Weevil-managed components found.".bright_green());
+        println!();
+        return Ok(());
+    }
+    
+    // Show numbered list
+    println!("{}", "Found Weevil-managed components:".bright_yellow().bold());
+    println!();
+    for (i, target) in all_targets.iter().enumerate() {
+        println!("  {}. {} — {}", 
+            (i + 1).to_string().bright_cyan().bold(),
+            target.label(),
+            format!("{} at {}", format_size(target.size()), target.path().display()).dimmed()
+        );
+    }
+    println!();
+    
+    // Resolve selected indices
+    let indices = targets.unwrap();
+    let mut selected = Vec::new();
+    for idx in indices {
+        if idx == 0 || idx > all_targets.len() {
+            println!("{} Invalid selection: {}. Valid range is 1–{}", 
+                "✗".red(), idx, all_targets.len());
+            return Ok(());
+        }
+        selected.push(all_targets[idx - 1].clone());
+    }
+    
+    if dry_run {
+        print_dry_run(&selected);
+        return Ok(());
+    }
+    
+    print_removal_list(&selected);
+    
+    if !confirm()? {
+        return Ok(());
+    }
+    
+    execute_removal(&selected);
+    
+    Ok(())
+}
+
+/// Full uninstall — removes the entire .weevil directory
+fn full_uninstall(sdk_config: &SdkConfig, dry_run: bool) -> Result<()> {
+    if !sdk_config.cache_dir.exists() {
+        println!("{}", "No Weevil-managed components found.".bright_green());
+        println!();
+        return Ok(());
+    }
+    
+    let size = dir_size(&sdk_config.cache_dir);
+    
+    if dry_run {
+        let all_targets = scan_targets(sdk_config);
+        
+        println!("{}", "── Dry Run ─────────────────────────────────────────────────".bright_yellow().bold());
+        println!();
+        println!("{}", format!("Contents of {}:", sdk_config.cache_dir.display()).bright_yellow().bold());
+        println!();
+        for (i, target) in all_targets.iter().enumerate() {
+            println!("  {}. {} — {}", 
+                (i + 1).to_string().bright_cyan().bold(),
+                target.label(),
+                format!("{} at {}", format_size(target.size()), target.path().display()).dimmed()
+            );
+        }
+        
+        // Note any system-installed dependencies that Weevil doesn't manage
+        let mut has_external = false;
+        
+        if sdk_config.android_sdk_path.exists() 
+            && !sdk_config.android_sdk_path.to_string_lossy().contains(".weevil") {
+            if !has_external {
+                println!();
+                has_external = true;
+            }
+            println!("  {} Android SDK at {} — not managed by Weevil, will not be removed", 
+                "ⓘ".bright_cyan(),
+                sdk_config.android_sdk_path.display()
+            );
+        }
+        
+        if let Ok(gradle_version) = check_gradle() {
+            if !has_external {
+                println!();
+            }
+            println!("  {} Gradle {} — not managed by Weevil, will not be removed", 
+                "ⓘ".bright_cyan(),
+                gradle_version
+            );
+        }
+        
+        println!();
+        println!("{}", format!("Total: {} ({})", sdk_config.cache_dir.display(), format_size(size)).bright_yellow().bold());
+        println!();
+        println!("{}", "To remove everything:".bright_yellow().bold());
+        println!("  {}", "weevil uninstall".bright_cyan());
+        println!();
+        println!("{}", "To remove specific items:".bright_yellow().bold());
+        println!("  {}", "weevil uninstall --only 1 2".bright_cyan());
+        println!();
+        return Ok(());
+    }
+    
+    println!("{}", "This will permanently remove:".bright_yellow().bold());
+    println!();
+    println!("  {} {}  ({})", "✗".red(), sdk_config.cache_dir.display(), format_size(size));
+    println!();
+    println!("{}", "Everything Weevil installed will be gone.".bright_yellow());
+    println!();
+    
+    if !confirm()? {
+        return Ok(());
+    }
+    
+    println!();
+    print!("  Removing {} ... ", sdk_config.cache_dir.display());
+    match fs::remove_dir_all(&sdk_config.cache_dir) {
+        Ok(_) => {
+            println!("{}", "✓".green());
+            println!();
+            println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+            println!("{}", "   ✓ Uninstall Complete".bright_green().bold());
+            println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+            println!();
+            println!("{}", "Weevil binary is still installed. To remove it, delete the weevil executable.".bright_yellow());
+            println!();
+            println!("{}", "To reinstall dependencies later:".bright_yellow().bold());
+            println!("  {}", "weevil setup".bright_cyan());
+        }
+        Err(e) => {
+            println!("{} ({})", "✗".red(), e);
+            println!();
+            println!("{}", "You may need to manually remove this directory.".bright_yellow());
+        }
+    }
+    
+    println!();
+    Ok(())
+}
+
+fn print_dry_run(selected: &[RemoveTarget]) {
+    println!("{}", "── Dry Run ─────────────────────────────────────────────────".bright_yellow().bold());
+    println!();
+    println!("{}", "The following would be removed:".bright_yellow());
+    println!();
+    let mut total: u64 = 0;
+    for target in selected {
+        let size = target.size();
+        total += size;
+        println!("  {} {}  ({})", "✗".red(), target.label(), format_size(size));
+        println!("    {}", target.path().display().to_string().dimmed());
+    }
+    println!();
+    println!("{}", format!("Total: {}", format_size(total)).bright_yellow().bold());
+    println!();
+    println!("{}", "Run without --dry-run to actually remove these components.".dimmed());
+    println!();
+}
+
+fn print_removal_list(selected: &[RemoveTarget]) {
+    println!("{}", "The following will be removed:".bright_yellow().bold());
+    println!();
+    let mut total: u64 = 0;
+    for target in selected {
+        let size = target.size();
+        total += size;
+        println!("  {} {}  ({})", "✗".red(), target.label(), format_size(size));
+        println!("    {}", target.path().display().to_string().dimmed());
+    }
+    println!();
+    println!("{}", format!("Total: {}", format_size(total)).bright_yellow().bold());
+    println!();
+}
+
+fn confirm() -> Result<bool> {
+    print!("{}", "Are you sure you want to continue? (y/N): ".bright_yellow());
+    io::stdout().flush()?;
+    
+    let mut input = String::new();
+    io::stdin().read_line(&mut input)?;
+    let answer = input.trim().to_lowercase();
+    
+    if answer != "y" && answer != "yes" {
+        println!();
+        println!("{}", "Uninstall cancelled.".bright_green());
+        println!();
+        return Ok(false);
+    }
+    
+    Ok(true)
+}
+
+fn execute_removal(selected: &[RemoveTarget]) {
+    println!();
+    println!("{}", "Removing components...".bright_yellow());
+    println!();
+    
+    let mut removed = Vec::new();
+    let mut failed = Vec::new();
+    
+    for target in selected {
+        print!("  Removing {}... ", target.label());
+        match fs::remove_dir_all(target.path()) {
+            Ok(_) => {
+                println!("{}", "✓".green());
+                removed.push(target.clone());
+            }
+            Err(e) => {
+                println!("{} ({})", "✗".red(), e);
+                failed.push((target.clone(), e.to_string()));
+            }
+        }
+    }
+    
+    println!();
+    println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+    
+    if failed.is_empty() {
+        println!("{}", "   ✓ Uninstall Complete".bright_green().bold());
+        println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+        println!();
+        println!("{}", "Removed:".bright_green().bold());
+        for target in &removed {
+            println!("  {} {}", "✓".green(), target.label());
+        }
+    } else {
+        println!("{}", "   ⚠ Uninstall Completed with Errors".bright_yellow().bold());
+        println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+        println!();
+        if !removed.is_empty() {
+            println!("{}", "Removed:".bright_green().bold());
+            for target in &removed {
+                println!("  {} {}", "✓".green(), target.label());
+            }
+            println!();
+        }
+        println!("{}", "Failed to remove:".bright_red().bold());
+        for (target, error) in &failed {
+            println!("  {} {}: {}", "✗".red(), target.label(), error);
+        }
+        println!();
+        println!("{}", "You may need to manually remove these directories.".bright_yellow());
+    }
+    
+    println!();
+    println!("{}", "To reinstall dependencies later:".bright_yellow().bold());
+    println!("  {}", "weevil setup".bright_cyan());
+    println!();
+}
+
+/// Scan the cache directory for individual removable components (used by --only)
+fn scan_targets(sdk_config: &SdkConfig) -> Vec<RemoveTarget> {
+    let mut targets = Vec::new();
+    
+    if sdk_config.cache_dir.exists() {
+        if let Ok(entries) = fs::read_dir(&sdk_config.cache_dir) {
+            for entry in entries.flatten() {
+                let name = entry.file_name().to_string_lossy().to_string();
+                let path = entry.path();
+                
+                if !path.is_dir() {
+                    continue;
+                }
+                
+                if name.starts_with("ftc-sdk") {
+                    let version = crate::sdk::ftc::get_version(&path)
+                        .unwrap_or_else(|_| {
+                            if name == "ftc-sdk" {
+                                "default".to_string()
+                            } else {
+                                name.trim_start_matches("ftc-sdk-").to_string()
+                            }
+                        });
+                    targets.push(RemoveTarget::FtcSdk(path, version));
+                }
+            }
+        }
+    }
+    
+    // Android SDK — only if Weevil installed it (lives inside .weevil)
+    if sdk_config.android_sdk_path.exists() 
+        && sdk_config.android_sdk_path.to_string_lossy().contains(".weevil") {
+        targets.push(RemoveTarget::AndroidSdk(sdk_config.android_sdk_path.clone()));
+    }
+    
+    targets
+}
+
+fn check_gradle() -> Result<String> {
+    let output = std::process::Command::new("gradle")
+        .arg("--version")
+        .output();
+    
+    match output {
+        Ok(out) => {
+            let stdout = String::from_utf8_lossy(&out.stdout);
+            for line in stdout.lines() {
+                if line.starts_with("Gradle") {
+                    return Ok(line.replace("Gradle ", ""));
+                }
+            }
+            Ok("installed (version unknown)".to_string())
+        }
+        Err(_) => anyhow::bail!("Gradle not found"),
+    }
+}
+
+fn dir_size(path: &PathBuf) -> u64 {
+    let mut size: u64 = 0;
+    if let Ok(entries) = fs::read_dir(path) {
+        for entry in entries.flatten() {
+            let path = entry.path();
+            if path.is_dir() {
+                size += dir_size(&path);
+            } else if let Ok(metadata) = path.metadata() {
+                size += metadata.len();
+            }
+        }
+    }
+    size
+}
+
+fn format_size(bytes: u64) -> String {
+    if bytes >= 1_073_741_824 {
+        format!("{:.1} GB", bytes as f64 / 1_073_741_824.0)
+    } else if bytes >= 1_048_576 {
+        format!("{:.1} MB", bytes as f64 / 1_048_576.0)
+    } else if bytes >= 1_024 {
+        format!("{:.1} KB", bytes as f64 / 1_024.0)
+    } else {
+        format!("{} B", bytes)
+    }
+}

src/main.rs

@@ -33,6 +33,26 @@ enum Commands {
         android_sdk: Option<String>,
     },
     
+    /// Check system health and diagnose issues
+    Doctor,
+    
+    /// Setup development environment (system or project)
+    Setup {
+        /// Path to project directory (optional - without it, sets up system)
+        path: Option<String>,
+    },
+    
+    /// Remove Weevil-installed SDKs and dependencies
+    Uninstall {
+        /// Show what would be removed without actually removing anything
+        #[arg(long)]
+        dry_run: bool,
+        
+        /// Remove only specific items by number (use --dry-run first to see the list)
+        #[arg(long, value_name = "NUM", num_args = 1..)]
+        only: Option<Vec<usize>>,
+    },
+    
     /// Upgrade an existing project to the latest generator version
     Upgrade {
         /// Path to the project directory
@@ -99,6 +119,15 @@ fn main() -> Result<()> {
         Commands::New { name, ftc_sdk, android_sdk } => {
             commands::new::create_project(&name, ftc_sdk.as_deref(), android_sdk.as_deref())
         }
+        Commands::Doctor => {
+            commands::doctor::run_diagnostics()
+        }
+        Commands::Setup { path } => {
+            commands::setup::setup_environment(path.as_deref())
+        }
+        Commands::Uninstall { dry_run, only } => {
+            commands::uninstall::uninstall_dependencies(dry_run, only)
+        }
         Commands::Upgrade { path } => {
             commands::upgrade::upgrade_project(&path)
         }