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

templates/basic/README.md.tmpl

@@ -1,29 +1,38 @@
 # {{PROJECT_NAME}}
 
-Arduino project generated by Anvil v{{ANVIL_VERSION}}.
+Arduino project generated by [Anvil](https://github.com/nexusworkshops/anvil) v{{ANVIL_VERSION}}.
+
+This project is self-contained. After creation, it only needs `arduino-cli`
+in PATH -- the Anvil binary is not required for day-to-day work.
 
 ## Quick Start
 
 ```bash
-# Check your system
-anvil doctor
+# Compile only (verify)
+./build.sh
 
-# Find connected boards
-anvil devices
-
-# Compile only (no upload)
-anvil build --verify {{PROJECT_NAME}}
-
-# Compile and upload
-anvil build {{PROJECT_NAME}}
+# Compile and upload to board
+./upload.sh
 
 # Compile, upload, and open serial monitor
-anvil build --monitor {{PROJECT_NAME}}
+./upload.sh --monitor
+
+# Open serial monitor (no compile)
+./monitor.sh
+
+# Persistent monitor (reconnects after reset/replug)
+./monitor.sh --watch
 
 # Run host-side unit tests (no board needed)
-cd test && ./run_tests.sh
+./test/run_tests.sh
 ```
 
+On Windows, use `build.bat`, `upload.bat`, `monitor.bat`, and
+`test\run_tests.bat` instead.
+
+All scripts read settings from `.anvil.toml` -- edit it to change
+the board, baud rate, include paths, or compiler flags.
+
 ## Project Structure
 
 ```
@@ -44,6 +53,9 @@ cd test && ./run_tests.sh
         CMakeLists.txt             Test build system
         run_tests.sh               Test runner (Linux/Mac)
         run_tests.bat              Test runner (Windows)
+    build.sh / build.bat           Compile sketch
+    upload.sh / upload.bat         Compile + upload to board
+    monitor.sh / monitor.bat       Serial monitor
     .anvil.toml                    Project configuration
 ```
 
@@ -52,7 +64,7 @@ cd test && ./run_tests.sh
 All hardware access goes through the `Hal` interface. The app code
 (`lib/app/`) depends only on `Hal`, never on `Arduino.h` directly.
 This means the app can be compiled and tested on the host without
-any Arduino SDK.
+any Arduino hardware.
 
 Two HAL implementations:
 - `ArduinoHal` -- passthroughs to real hardware (used in the .ino)
@@ -72,3 +84,9 @@ extra_flags = ["-Werror"]
 [monitor]
 baud = 115200
 ```
+
+## Prerequisites
+
+- `arduino-cli` in PATH with `arduino:avr` core installed
+- For host tests: `cmake`, `g++` (or `clang++`), `git`
+- Install everything at once: `anvil setup`