Bump version to v1.6.7 (pre-release)

SPH time-slot entities are labelled as the inverter and the Growatt app number
them (#386). Display names only - entity IDs are unchanged, so automations
referencing them keep working.

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

Author: 0xAHA

RELEASENOTES.md

@@ -4,9 +4,11 @@
 
 ---
 
-## Unreleased
+## v1.6.7 (pre-release)
 
-Merged to `main`, not yet in any release.
+Issues: #386
+
+> **Pre-release for testing.** v1.6.2 remains the stable release.
 
 - **SPH time-slot entities are now named after the slot the inverter actually uses.** The
   three Grid First slots displayed as "Grid First Period 7/8/9" but are slots **1, 2 and 3**

custom_components/growatt_modbus/manifest.json

@@ -14,5 +14,5 @@
     "pymodbus>=3.0.0",
     "pyserial>=3.4"
   ],
-  "version": "1.6.6"
+  "version": "1.6.7"
 }