- Make href Optional[str] = None for pattern capabilities
- Remove observe field (v2 architecture observes all hrefs)
- Add rt_filter, match_fn, key_fn fields to Capability
- Add entities default value tuple[()] to Capability
- Add key_override field to BoundEntity
- Update _key() to use key_override when present
- Update _make_observe_paths() to observe all unique hrefs (OBSERVE as accelerator)
- Guard _build() to skip pattern capabilities (href is None)
- Add test_bound_entity_key_override_takes_precedence test
- Update test_capability_defaults to remove observe assertion
All 61 tests passing (60 existing + 1 new).
C1: SwitchDesc MQTT discovery now emits payload_on/off='On'/'Off',
state_on/off='On'/'Off', and a Jinja2 boolean-to-string value_template
so HA can correctly interpret and command switch entities.
C2: POWER write_fn corrected — path is ['power','vs','0'] segment list
(not a single slash-prefixed string), and payload comparison is
p == 'On' (not truthiness) so 'Off' can actually be sent.
I2: Golden regression oracle strengthened to exact equality for both
state_keys and discovery_unique_ids; prior subset-only check allowed
over-production to go undetected. Two golden tests now fail revealing
stale fixtures (dishwasher: +3 keys; refrigerator: +9 keys) — fixtures
intentionally NOT updated, human review required.