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/build.sh

@@ -0,0 +1,145 @@
+#!/usr/bin/env bash
+#
+# build.sh -- Compile the sketch using arduino-cli
+#
+# Reads all settings from .anvil.toml. No Anvil binary required.
+#
+# Usage:
+#   ./build.sh              Compile (verify only)
+#   ./build.sh --clean      Delete build cache first
+#   ./build.sh --verbose    Show full compiler output
+#
+# Prerequisites: arduino-cli in PATH, arduino:avr core installed
+#   Install: anvil setup  (or manually: arduino-cli core install arduino:avr)
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+CONFIG="$SCRIPT_DIR/.anvil.toml"
+
+# -- Colors ----------------------------------------------------------------
+if [[ -t 1 ]]; then
+    RED=$'\033[0;31m'; GRN=$'\033[0;32m'; YLW=$'\033[0;33m'
+    CYN=$'\033[0;36m'; BLD=$'\033[1m';    RST=$'\033[0m'
+else
+    RED=''; GRN=''; YLW=''; CYN=''; BLD=''; RST=''
+fi
+
+ok()   { echo "${GRN}ok${RST}   $*"; }
+warn() { echo "${YLW}warn${RST} $*"; }
+die()  { echo "${RED}FAIL${RST} $*" >&2; exit 1; }
+
+# -- Parse .anvil.toml -----------------------------------------------------
+[[ -f "$CONFIG" ]] || die "No .anvil.toml found in $SCRIPT_DIR"
+
+# Extract a simple string value: toml_get "key"
+# Searches the whole file; for sectioned keys, grep is specific enough
+# given our small, flat schema.
+toml_get() {
+    (grep "^$1 " "$CONFIG" 2>/dev/null || true) | head -1 | sed 's/.*= *"\{0,1\}\([^"]*\)"\{0,1\}/\1/' | tr -d ' '
+}
+
+# Extract a TOML array as space-separated values: toml_array "key"
+toml_array() {
+    (grep "^$1 " "$CONFIG" 2>/dev/null || true) | head -1 \
+        | sed 's/.*\[//; s/\].*//; s/"//g; s/,/ /g' | tr -s ' '
+}
+
+SKETCH_NAME="$(toml_get 'name')"
+FQBN="$(toml_get 'fqbn')"
+WARNINGS="$(toml_get 'warnings')"
+INCLUDE_DIRS="$(toml_array 'include_dirs')"
+EXTRA_FLAGS="$(toml_array 'extra_flags')"
+
+[[ -n "$SKETCH_NAME" ]] || die "Could not read project name from .anvil.toml"
+[[ -n "$FQBN" ]]        || die "Could not read fqbn from .anvil.toml"
+
+SKETCH_DIR="$SCRIPT_DIR/$SKETCH_NAME"
+BUILD_DIR="$SCRIPT_DIR/.build"
+
+# -- Parse arguments -------------------------------------------------------
+DO_CLEAN=0
+VERBOSE=""
+
+for arg in "$@"; do
+    case "$arg" in
+        --clean)   DO_CLEAN=1 ;;
+        --verbose) VERBOSE="--verbose" ;;
+        -h|--help)
+            echo "Usage: ./build.sh [--clean] [--verbose]"
+            echo "  Compiles the sketch. Settings from .anvil.toml."
+            exit 0
+            ;;
+        *) die "Unknown option: $arg" ;;
+    esac
+done
+
+# -- Preflight -------------------------------------------------------------
+command -v arduino-cli &>/dev/null \
+    || die "arduino-cli not found in PATH. Install it first."
+
+[[ -d "$SKETCH_DIR" ]] \
+    || die "Sketch directory not found: $SKETCH_DIR"
+
+[[ -f "$SKETCH_DIR/$SKETCH_NAME.ino" ]] \
+    || die "Sketch file not found: $SKETCH_DIR/$SKETCH_NAME.ino"
+
+# -- Clean -----------------------------------------------------------------
+if [[ $DO_CLEAN -eq 1 ]] && [[ -d "$BUILD_DIR" ]]; then
+    echo "${YLW}Cleaning build cache...${RST}"
+    rm -rf "$BUILD_DIR"
+    ok "Cache cleared."
+fi
+
+# -- Build include flags ---------------------------------------------------
+BUILD_FLAGS=""
+for dir in $INCLUDE_DIRS; do
+    abs="$SCRIPT_DIR/$dir"
+    if [[ -d "$abs" ]]; then
+        BUILD_FLAGS="$BUILD_FLAGS -I$abs"
+    else
+        warn "Include directory not found: $dir"
+    fi
+done
+for flag in $EXTRA_FLAGS; do
+    BUILD_FLAGS="$BUILD_FLAGS $flag"
+done
+
+# -- Compile ---------------------------------------------------------------
+echo "${CYN}${BLD}Compiling ${SKETCH_NAME}...${RST}"
+echo "  Board:    $FQBN"
+echo "  Sketch:   $SKETCH_DIR"
+echo ""
+
+mkdir -p "$BUILD_DIR"
+
+COMPILE_ARGS=(
+    compile
+    --fqbn "$FQBN"
+    --build-path "$BUILD_DIR"
+    --warnings "$WARNINGS"
+)
+
+if [[ -n "$BUILD_FLAGS" ]]; then
+    COMPILE_ARGS+=(--build-property "build.extra_flags=$BUILD_FLAGS")
+fi
+
+if [[ -n "$VERBOSE" ]]; then
+    COMPILE_ARGS+=("$VERBOSE")
+fi
+
+COMPILE_ARGS+=("$SKETCH_DIR")
+
+arduino-cli "${COMPILE_ARGS[@]}" || die "Compilation failed."
+
+echo ""
+ok "Compile succeeded."
+
+# -- Binary size -----------------------------------------------------------
+ELF="$BUILD_DIR/$SKETCH_NAME.ino.elf"
+if [[ -f "$ELF" ]] && command -v avr-size &>/dev/null; then
+    echo ""
+    avr-size --mcu=atmega328p -C "$ELF"
+fi
+
+echo ""