Enable CI gate: fix Doxygen and add workflow.

Clear doc-block warnings so doxygen exits 0, add GitHub Actions
for host tests, Doxygen, and manual sync, and document CI in the manual.

Co-authored-by: Cursor <cursoragent@cursor.com>

Software/components/net/include/net/NetBootstrap.hpp

@@ -63,9 +63,12 @@ public:
      * @brief    start — init platform and join stored Wi-Fi or open SoftAP.
      *
      * @dname    start
-     * @param    store  Secure store consulted for saved STA credentials.
-     * @param    tuner  Tuner service exposed by the HTTP API.
-     * @param    audio  Audio service exposed by the HTTP API.
+     * @param    store           Secure store consulted for saved STA credentials.
+     * @param    tuner           Tuner service exposed by the HTTP API.
+     * @param    audio           Audio service exposed by the HTTP API.
+     * @param    bluetooth       Bluetooth pairing service for REST routes.
+     * @param    stations        Station preset service for REST routes.
+     * @param    companionChips  Boot flags exposed on GET /api/health.
      * @return   NetBootstrap on success, or a NetError.
      * @pubstate none
      *

Software/components/net/include/net/SetupWebServer.hpp

@@ -137,8 +137,9 @@ public:
      * @param    netState  Active network phase exposed to handlers.
      * @param    tuner     Tuner service for the tuner REST routes.
      * @param    audio     Audio service for the audio REST routes.
-     * @param    bluetooth Bluetooth service for pairing REST routes.
-     * @param    stations  Station preset service for list REST routes.
+     * @param    bluetooth       Bluetooth service for pairing REST routes.
+     * @param    stations        Station preset service for list REST routes.
+     * @param    companionChips  Boot flags for GET /api/health.
      * @return   Ok on success, or NetError::HttpServerStartFailed.
      * @pubstate writes server_, store_, netState_, and service pointers on success.
      *