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

Cargo.toml

@@ -40,11 +40,10 @@ colored = "2.1"
 which = "5.0"
 home = "=0.5.9"
 
-# Signal handling
-ctrlc = "3.4"
+# Temp dirs (for refresh command)
+tempfile = "3.13"
 
 [dev-dependencies]
-tempfile = "3.13"
 assert_cmd = "2.0"
 predicates = "3.1"
 
@@ -52,4 +51,4 @@ predicates = "3.1"
 opt-level = 3
 lto = true
 codegen-units = 1
-strip = true
+strip = true