feat(wake): add controller-free USB serial wake beacon

Add a standalone Pico2W image reusing the configured nonconnectable wake
burst without Bluepad32, controller-host profiles, Classic/LE-central
roles, connection pools, pairing or writable TLV storage. Explicitly
disable and verify Classic inquiry/page scan before declaring readiness.
Keep the original controller firmware and captured wake identity unchanged.

Expose bounded SPWB1 CDC commands with exactly-once request IDs, explicit
failures and radio progress independent of serial backpressure. Add the
cross-platform switch-pico-wake script with strict preflight, bounded I/O,
no automatic rebroadcast, status-only mode and preserved uncertain-outcome
metadata. Standard USB serial requires no WinUSB/Zadig binding.

Add isolated --wake-only build/publication selection and document setup,
backup and physical-BOOTSEL recovery. Validate776 tests, focused framing
and lifecycle cases, ELF isolation and actual CDC operation on only the
new board. One burst completed in2.095s; malformed/status/reconnect input
and same-ID replay caused no additional broadcast. Original Pico untouched.
Private firmware images, console configuration and backups are excluded.

pyproject.toml

@@ -22,6 +22,7 @@ dependencies = [
 controller-uart-bridge = "switch_pico_bridge.controller_uart_bridge:main"
 host-uart-logger = "switch_pico_bridge.host_uart_logger:main"
 switch-pico-config = "switch_pico_bridge.config_manager:main"
+switch-pico-wake = "switch_pico_bridge.wake_beacon:main"
 
 [tool.setuptools]
 package-dir = {"" = "src"}