v1.7.2

Added

• WH54 diagnostic entities — Filter Level and Heater Counter: Two new diagnostic entities are now exposed for WH54 liquid depth sensors using the /get_cli_lds configuration endpoint (API spec V1.0.4+). Liquid Depth Filter Level CH{N} reports the Data Filter Factor (an integer setting that controls sensor smoothing), and Liquid Depth Heater Counter CH{N} reports the cumulative heater activation count (state_class: total_increasing), useful for diagnosing WH54 operation in cold climates. These entities appear under the WH54 device alongside the existing air/depth/voltage entities. (issue #169)