feat: Capability-Based Entity Filtering (v0.5.0)

[onpremcloudguy]

Summary

Intelligent entity filtering based on vehicle hardware capabilities, trim level, and equipment detection. Vehicles only show entities for features they actually have.

Key Changes

• Capability filtering - all 9 entity platforms check vehicle capability flags before creating entities
• Sentinel value 101 - position fields returning 101 (not equipped) normalised to None; sunroof/curtain entities excluded on non-equipped vehicles
• V2-to-V1 capability mapping - 10-entry alias dict + 3 inferred capabilities
• Vehicle model/edition detection - VehicleModel and VehicleEdition enums from matCode
• Edition-based filtering - PM2.5 sensors excluded on Pure/Pro, seat heating on Pure
• Hardware equipment filtering - equipped_fn callback with stale entity registry cleanup
• Static data caching - capabilities, ability, plant_no cached after first fetch (3 fewer API calls per poll)
• Frontend fixes - custom cards registered as Lovelace resources (fixes race condition on hard refresh); connectedCallback + loading placeholder; async_setup early registration
• Default capability changed - unknown capabilities default to False (safe-by-default)
• Dashboard conditionals - sunroof cards wrapped in conditional for non-equipped vehicles
• API documentation - matCode decoding, sentinel values, V2-V1 mapping, command parameters

Entity Impact

• Added: 2 diagnostic sensors (vehicle_model, vehicle_edition)
• Removed (on test vehicle without sunroof): 6 sunroof/curtain entities + 1 stale washer_fluid
• Net: 192 entities (from 197)
• Fully-equipped vehicles: zero regression

Spec

Implements specs/006-capability-entity-filtering - all 21 tasks complete, all 5 success criteria met.