[flowcool]

Problem

The generic package derives technical identity from the display label. Changing a plant label can therefore change MQTT topic and discovery identity, which makes an upstream consumer migrate entities for a presentation-only change.

Change

• Keep a configured device name as the technical identity and use the display label only for human-facing text.
• Use stable function names for entities, with MAC/device-name generators for discovery identity.
• Remove the generic package's MQTT topic-prefix override and document the migration paths for existing installs.
• Keep standalone examples and printable metadata compatible.

This contribution contains no inventory, Home Assistant state, fork infrastructure, or device-specific values. It is a generic package change for V2R1.

Validation

• 79 existing tests plus tests/test_identity_schema.py.
• ESPHome 2026.10 isolated MQTT firmware build with synthetic credentials.
• The schema proof changes the display label and verifies stable technical names, topic prefix, and discovery generators.

Refs #42