Add Bluetooth Proxy firmware switching from HA

Integrations/ESPHome/Core.yaml

@@ -1,12 +1,13 @@
 substitutions:
-  version:  "26.7.8.4"
+  version:  "26.7.8.5"
   device_description: ${name} made by Apollo Automation - version ${version}.
   # Default OTA password. Override in your device YAML by re-declaring
   # `substitutions: { ota_password: !secret <name>_ota_password }` so each
   # device on your network uses a unique secret instead of the shared default.
   ota_password: "apolloautomation"
-  # Firmware variant identity: overridden to "true" by MSR-1_BLE.yaml so
-  # each image tracks its own OTA manifests.
+  # Firmware variant identity: overridden to "true" by MSR-1_BLE.yaml. Seeds
+  # the Bluetooth Proxy select on boot so it self-corrects to what is
+  # actually running after a failed or abandoned switch.
   ble_firmware: "false"
   # Default update channel on first boot (no stored user choice yet, i.e. a
   # fresh flash). The beta-channel builds override this to "Beta" (see
@@ -18,6 +19,22 @@ substitutions:
   stable_manifest_base: "https://apolloautomation.github.io/MSR-1"
   beta_manifest_base: "https://github.com/ApolloAutomation/MSR-1/releases/download/beta-fw"
 
+esphome:
+  # List form so package merging concatenates with each variant's own on_boot
+  # entries (mapping form would be replaced by the variant's block instead).
+  on_boot:
+    - priority: -100
+      then:
+        # The Bluetooth Proxy select mirrors the firmware actually running, so
+        # a failed or abandoned switch snaps back to the truth on reboot.
+        - lambda: |-
+            if (std::string("${ble_firmware}") == "true") {
+              id(firmware_ble).publish_state("Enabled");
+            } else {
+              id(firmware_ble).publish_state("Disabled");
+            }
+        - script.execute: apply_ota_source
+
 esp32:
   variant: esp32c3
   flash_size: 4MB
@@ -768,14 +785,29 @@ select:
       then:
         - script.execute: apply_ota_source
 
+  - platform: template
+    name: "Bluetooth Proxy"
+    id: firmware_ble
+    icon: mdi:bluetooth
+    entity_category: "config"
+    optimistic: true
+    restore_value: true
+    options:
+      - "Disabled"
+      - "Enabled"
+    initial_option: "Disabled"
+    on_value:
+      then:
+        - script.execute: apply_ota_source
+
 script:
   - id: apply_ota_source
-    # Sets the OTA manifest URL from the Firmware Channel select
-    # (Stable/Beta) for the firmware variant this image was built as.
+    # Sets the OTA manifest URL from the two selectors: Bluetooth Proxy
+    # (Disabled/Enabled) x Firmware Channel (Stable/Beta).
     # Stable = GitHub Pages, Beta = rolling "beta" release assets.
     then:
       - lambda: |-
-          const bool ble  = std::string("${ble_firmware}") == "true";
+          const bool ble  = id(firmware_ble).current_option() == "Enabled";
           const bool beta = id(firmware_channel).current_option() == "Beta";
           std::string url;
           if (beta) {