Refactor CLI, add refresh command, fix port detection, add device tracking

- Remove build/upload/monitor subcommands (projects are self-contained)
- Remove ctrlc dependency (only used by removed monitor watch mode)
- Update next-steps messaging to reference project scripts directly

- Add 'anvil refresh [DIR] [--force]' to update project scripts
  to latest templates without touching user code

- Fix Windows port detection: replace fragile findstr/batch TOML
  parsing with proper comment-skipping logic; add _detect_port.ps1
  helper for reliable JSON-based port detection via PowerShell

- Add .anvil.local for machine-specific config (gitignored)
  - 'anvil devices --set [PORT] [-d DIR]' saves port + VID:PID
  - 'anvil devices --get [-d DIR]' shows saved port status
  - VID:PID tracks USB devices across COM port reassignment
  - Port resolution: -p flag > VID:PID > saved port > auto-detect
  - Uppercase normalization for Windows COM port names

- Update all .bat/.sh templates to read from .anvil.local
- Remove port entries from .anvil.toml (no machine-specific config in git)
- Add .anvil.local to .gitignore template
- Expand 'anvil devices' output with VID:PID, serial number, and
  usage instructions

src/commands/new.rs

@@ -177,7 +177,12 @@ fn init_git(project_dir: &PathBuf, template_name: &str) {
 fn make_executable(project_dir: &PathBuf) {
     use std::os::unix::fs::PermissionsExt;
 
-    let scripts = ["test/run_tests.sh"];
+    let scripts = [
+        "build.sh",
+        "upload.sh",
+        "monitor.sh",
+        "test/run_tests.sh",
+    ];
     for script in &scripts {
         let path = project_dir.join(script);
         if path.exists() {
@@ -196,23 +201,67 @@ fn print_next_steps(project_name: &str) {
         "  1. {}",
         format!("cd {}", project_name).bright_cyan()
     );
-    println!("  2. Check your system:  {}", "anvil doctor".bright_cyan());
+
+    if cfg!(target_os = "windows") {
+        println!(
+            "  2. Compile:            {}",
+            "build.bat".bright_cyan()
+        );
+        println!(
+            "  3. Upload to board:    {}",
+            "upload.bat".bright_cyan()
+        );
+        println!(
+            "  4. Upload + monitor:   {}",
+            "upload.bat --monitor".bright_cyan()
+        );
+        println!(
+            "  5. Serial monitor:     {}",
+            "monitor.bat".bright_cyan()
+        );
+        println!(
+            "  6. Run host tests:     {}",
+            "test\\run_tests.bat".bright_cyan()
+        );
+        println!();
+        println!(
+            "  {}",
+            "On Linux/macOS: ./build.sh, ./upload.sh, ./monitor.sh"
+                .bright_black()
+        );
+    } else {
+        println!(
+            "  2. Compile:            {}",
+            "./build.sh".bright_cyan()
+        );
+        println!(
+            "  3. Upload to board:    {}",
+            "./upload.sh".bright_cyan()
+        );
+        println!(
+            "  4. Upload + monitor:   {}",
+            "./upload.sh --monitor".bright_cyan()
+        );
+        println!(
+            "  5. Serial monitor:     {}",
+            "./monitor.sh".bright_cyan()
+        );
+        println!(
+            "  6. Run host tests:     {}",
+            "./test/run_tests.sh".bright_cyan()
+        );
+        println!();
+        println!(
+            "  {}",
+            "On Windows: build.bat, upload.bat, monitor.bat, test\\run_tests.bat"
+                .bright_black()
+        );
+    }
+
     println!(
-        "  3. Find your board:    {}",
-        "anvil devices".bright_cyan()
-    );
-    println!(
-        "  4. Build and upload:   {}",
-        format!("anvil build {}", project_name).bright_cyan()
-    );
-    println!(
-        "  5. Build + monitor:    {}",
-        format!("anvil build --monitor {}", project_name).bright_cyan()
-    );
-    println!();
-    println!(
-        "  Run host tests:        {}",
-        "cd test && ./run_tests.sh".bright_cyan()
+        "  {}",
+        "System check: anvil doctor | Port scan: anvil devices"
+            .bright_black()
     );
     println!();
 }
@@ -249,4 +298,4 @@ mod tests {
         let long_name = "a".repeat(51);
         assert!(validate_project_name(&long_name).is_err());
     }
-}
+}