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/monitor.bat

@@ -0,0 +1,113 @@
+@echo off
+setlocal enabledelayedexpansion
+
+:: monitor.bat -- Open the serial monitor
+::
+:: Reads baud rate from .anvil.toml. No Anvil binary required.
+::
+:: Usage:
+::   monitor.bat                Open monitor (auto-detect port)
+::   monitor.bat -p COM3       Specify port
+::   monitor.bat -b 9600       Override baud rate
+
+set "SCRIPT_DIR=%~dp0"
+set "CONFIG=%SCRIPT_DIR%.anvil.toml"
+set "LOCAL_CONFIG=%SCRIPT_DIR%.anvil.local"
+
+if not exist "%CONFIG%" (
+    echo FAIL: No .anvil.toml found in %SCRIPT_DIR%
+    exit /b 1
+)
+
+:: -- Parse .anvil.toml ----------------------------------------------------
+for /f "usebackq tokens=1,* delims==" %%a in ("%CONFIG%") do (
+    set "_K=%%a"
+    if not "!_K:~0,1!"=="#" if not "!_K:~0,1!"=="[" (
+        set "_K=!_K: =!"
+        set "_V=%%b"
+        if defined _V (
+            set "_V=!_V: =!"
+            set "_V=!_V:"=!"
+        )
+        if "!_K!"=="baud" set "BAUD=!_V!"
+    )
+)
+
+:: -- Parse .anvil.local (machine-specific, not in git) --------------------
+set "LOCAL_PORT="
+set "LOCAL_VID_PID="
+if exist "%LOCAL_CONFIG%" (
+    for /f "usebackq tokens=1,* delims==" %%a in ("%LOCAL_CONFIG%") do (
+        set "_K=%%a"
+        if not "!_K:~0,1!"=="#" (
+            set "_K=!_K: =!"
+            set "_V=%%b"
+            if defined _V (
+                set "_V=!_V: =!"
+                set "_V=!_V:"=!"
+            )
+            if "!_K!"=="port" set "LOCAL_PORT=!_V!"
+            if "!_K!"=="vid_pid" set "LOCAL_VID_PID=!_V!"
+        )
+    )
+)
+
+if "%BAUD%"=="" set "BAUD=115200"
+
+:: -- Parse arguments ------------------------------------------------------
+set "PORT="
+
+:parse_args
+if "%~1"=="" goto done_args
+if "%~1"=="-p" set "PORT=%~2" & shift & shift & goto parse_args
+if "%~1"=="--port" set "PORT=%~2" & shift & shift & goto parse_args
+if "%~1"=="-b" set "BAUD=%~2" & shift & shift & goto parse_args
+if "%~1"=="--baud" set "BAUD=%~2" & shift & shift & goto parse_args
+if "%~1"=="--help" goto show_help
+if "%~1"=="-h" goto show_help
+echo FAIL: Unknown option: %~1
+exit /b 1
+
+:show_help
+echo Usage: monitor.bat [-p PORT] [-b BAUD]
+echo   Opens serial monitor. Baud rate from .anvil.toml.
+exit /b 0
+
+:done_args
+
+:: -- Preflight ------------------------------------------------------------
+where arduino-cli >nul 2>nul
+if errorlevel 1 (
+    echo FAIL: arduino-cli not found in PATH.
+    exit /b 1
+)
+
+:: -- Resolve port ---------------------------------------------------------
+:: Priority: -p flag > VID:PID resolve > saved port > auto-detect
+if "%PORT%"=="" (
+    for /f "delims=" %%p in ('powershell -NoProfile -ExecutionPolicy Bypass -File "%SCRIPT_DIR%_detect_port.ps1" -VidPid "%LOCAL_VID_PID%" -SavedPort "%LOCAL_PORT%"') do (
+        if "!PORT!"=="" set "PORT=%%p"
+    )
+    if "!PORT!"=="" (
+        echo FAIL: No serial port detected. Specify with: monitor.bat -p COM3
+        echo   Or save a default: anvil devices --set
+        exit /b 1
+    )
+    if not "%LOCAL_VID_PID%"=="" (
+        if not "!PORT!"=="%LOCAL_PORT%" (
+            echo info  Device %LOCAL_VID_PID% found on !PORT! ^(moved from %LOCAL_PORT%^)
+        ) else (
+            echo info  Using port !PORT! ^(from .anvil.local^)
+        )
+    ) else if not "%LOCAL_PORT%"=="" (
+        echo info  Using port !PORT! ^(from .anvil.local^)
+    ) else (
+        echo warn Auto-detected port: !PORT! ^(use -p to override, or: anvil devices --set^)
+    )
+)
+
+:: -- Monitor --------------------------------------------------------------
+echo Opening serial monitor on %PORT% at %BAUD% baud...
+echo Press Ctrl+C to exit.
+echo.
+arduino-cli monitor -p %PORT% -c "baudrate=%BAUD%"