Integrate companion-chip status into GET /api/health (fw 0.6.0).

Expose Si4684, ADAU1701, and BT1035 boot flags via CompanionChipStatus after
HardwareBootstrap; update API manual schema for Slice 8.

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

Software/components/core/include/core/CompanionChipStatus.hpp

@@ -0,0 +1,33 @@
+/**
+ * @file    CompanionChipStatus.hpp
+ * @brief   Boot-ready flags for Si4684, ADAU1701, and FSC-BT1035.
+ *
+ * DigiRadio firmware — https://github.com/manvalan/DigiRadio
+ *
+ * Copyright 2026 Michele Bigi
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * @author  Michele Bigi
+ * @date    2026-07-06
+ */
+#pragma once
+
+namespace core {
+
+/**
+ * @brief    CompanionChipStatus — companion-chip boot snapshot for /api/health.
+ *
+ * @dname    CompanionChipStatus
+ * @return   n/a (type)
+ * @pubstate Immutable aggregate; all true after successful HardwareBootstrap.
+ *
+ * @author   Michele Bigi
+ * @date     2026-07-06
+ */
+struct CompanionChipStatus {
+    bool si4684Ready;   ///< Si4684 HOST_LOAD completed.
+    bool adau1701Ready; ///< ADAU1701 SigmaStudio download completed.
+    bool bt1035Ready;   ///< BT1035 Line-In init (AT+AUXCFG=1) completed.
+};
+
+} // namespace core

Software/components/core/include/core/HealthStatus.hpp

@@ -18,6 +18,9 @@
 #pragma once
 
 #include "core/FirmwareVersion.hpp"
+#include "core/CompanionChipStatus.hpp"
+
+#include <optional>
 
 namespace core {
 
@@ -64,6 +67,21 @@ public:
      */
     [[nodiscard]] static HealthStatus ok(FirmwareVersion firmware);
 
+    /**
+     * @brief    ok — build health response including companion-chip flags.
+     *
+     * @dname    ok
+     * @param    firmware  Active firmware version to report.
+     * @param    chips     Si4684 / ADAU1701 / BT1035 boot snapshot.
+     * @return   HealthStatus with HealthState::Ok and chips populated.
+     * @pubstate none
+     *
+     * @author   Michele Bigi
+     * @date     2026-07-06
+     */
+    [[nodiscard]] static HealthStatus ok(FirmwareVersion firmware,
+                                       CompanionChipStatus chips);
+
     /**
      * @brief    state — read the health indicator.
      *
@@ -88,11 +106,28 @@ public:
      */
     [[nodiscard]] const FirmwareVersion& firmware() const noexcept;
 
+    /**
+     * @brief    chips — optional companion-chip boot flags.
+     *
+     * @dname    chips
+     * @return   Chip status when set by ok(..., chips); otherwise nullopt.
+     * @pubstate reads chips_.
+     *
+     * @author   Michele Bigi
+     * @date     2026-07-06
+     */
+    [[nodiscard]] const std::optional<CompanionChipStatus>& chips() const
+        noexcept;
+
 private:
     explicit HealthStatus(HealthState state, FirmwareVersion firmware);
 
+    explicit HealthStatus(HealthState state, FirmwareVersion firmware,
+                          CompanionChipStatus chips);
+
     HealthState state_;
     FirmwareVersion firmware_;
+    std::optional<CompanionChipStatus> chips_;
 };
 
 } // namespace core