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/_detect_port.ps1

@@ -0,0 +1,78 @@
+# _detect_port.ps1 -- Detect the best serial port via arduino-cli
+#
+# Called by upload.bat and monitor.bat. Outputs a single port name
+# (e.g. COM3) or nothing if no port is found.
+#
+# If .anvil.local contains a vid_pid, resolves the device to its
+# current COM port (handles reassignment after replug).
+# Falls back to saved port, then auto-detect.
+
+param(
+    [string]$VidPid = "",
+    [string]$SavedPort = ""
+)
+
+$ErrorActionPreference = 'SilentlyContinue'
+
+$raw = arduino-cli board list --format json 2>$null
+if (-not $raw) {
+    # No arduino-cli or no output; fall back to saved port
+    if ($SavedPort) { Write-Output $SavedPort }
+    exit
+}
+
+$data = $raw | ConvertFrom-Json
+if (-not $data.detected_ports) {
+    if ($SavedPort) { Write-Output $SavedPort }
+    exit
+}
+
+$serial = $data.detected_ports | Where-Object { $_.port.protocol -eq 'serial' }
+if (-not $serial) {
+    if ($SavedPort) { Write-Output $SavedPort }
+    exit
+}
+
+# -- Try VID:PID resolution first ------------------------------------------
+if ($VidPid) {
+    $parts = $VidPid -split ':'
+    if ($parts.Count -eq 2) {
+        $targetVid = $parts[0].ToLower()
+        $targetPid = $parts[1].ToLower()
+
+        foreach ($p in $serial) {
+            $pVid = ($p.port.properties.vid -replace '^0x','').ToLower()
+            $pPid = ($p.port.properties.pid -replace '^0x','').ToLower()
+            if ($pVid -eq $targetVid -and $pPid -eq $targetPid) {
+                Write-Output $p.port.address
+                exit
+            }
+        }
+
+        # VID:PID not found -- device not connected
+        # Fall through to saved port / auto-detect
+    }
+}
+
+# -- Fall back to saved port if it exists on the system --------------------
+if ($SavedPort) {
+    $found = $serial | Where-Object { $_.port.address -eq $SavedPort } | Select-Object -First 1
+    if ($found) {
+        Write-Output $SavedPort
+        exit
+    }
+    # Saved port not present either; fall through to auto-detect
+}
+
+# -- Auto-detect: prefer USB serial ports ----------------------------------
+$usb = $serial | Where-Object { $_.port.protocol_label -like '*USB*' } | Select-Object -First 1
+if ($usb) {
+    Write-Output $usb.port.address
+    exit
+}
+
+# Fall back to any serial port
+$any = $serial | Select-Object -First 1
+if ($any) {
+    Write-Output $any.port.address
+}