Bump version to 1.5.4

## Bug Fixes
- Fixed BLE advertising not starting on boot
- Fixed rc=21 (BLE_HS_EALREADY) error

## Documentation
- Various documentation updates

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: DerekSeaman

ESPHome Devices/irk-capture-base.yaml

@@ -32,7 +32,7 @@ esphome:
   friendly_name: ${friendly_name}
   project:
     name: "derekseaman.irk-capture"
-    version: "1.5.3"
+    version: "1.5.4"
 
 # IMPORTANT: Do NOT include esp32_ble:, esp32_ble_tracker:, or bluetooth_proxy: here.
 # The irk_capture component fully initializes and manages NimBLE itself.

ESPHome Devices/irk-capture-full.yaml

@@ -57,7 +57,7 @@ esphome:
   friendly_name: ${friendly_name}
   project:
     name: "derekseaman.irk-capture"
-    version: "1.5.3"
+    version: "1.5.4"
 
 # IMPORTANT: Do NOT include esp32_ble:, esp32_ble_tracker:, or bluetooth_proxy: here.
 # The irk_capture component fully initializes and manages NimBLE itself.

RELEASE_NOTES_v1.5.2.md

@@ -0,0 +1,11 @@
+# Release Notes v1.5.4
+
+## Bug Fixes
+
+- **Fixed BLE advertising not starting on boot**: Resolved an issue where BLE advertising would not automatically start when `start_on_boot: true` was configured. The advertising initialization now correctly waits for the NimBLE host to sync before starting.
+
+- **Fixed rc=21 (BLE_HS_EALREADY) error**: Added defensive handling to prevent advertising start failures when the BLE GAP was in a transitional state.
+
+## Documentation
+
+- Various documentation updates including improved installation instructions, ESP32 variant reference images, and browser compatibility notes for serial flashing.

RELEASE_NOTES_v1.5.4.md

@@ -23,7 +23,7 @@ namespace esphome {
 namespace irk_capture {
 
 static const char* const TAG = "irk_capture";
-static constexpr char VERSION[] = "1.5.3";
+static constexpr char VERSION[] = "1.5.4";
 static constexpr char HEX[] = "0123456789abcdef";
 
 // Global instance pointer for NimBLE callbacks that don't accept user args