The schema split's accept side was tested; the reject side was not - a
key leaking from the legacy arm into the neutral schema would have
passed silently.
- read_descriptor and notify_characteristic passthroughs join the frozen
surface so the first migrated node can subscribe without extending the
client; the comment now says which ops have callers today
- The choke-point test also validates through the public
BLE_CLIENT_SCHEMA, so removing the cv.All wiring fails a test
- DOMAIN no longer sits between the BTstack comment and the constant it
explains
- Drop unused includes (ble_client_state.h, <utility>) and the unused
notify/indicate property constants (no CCCD path yet)
- Note the frozen node-facing surface on the uncalled backend forwarders
- Keep the legacy-only 'name' key out of the neutral schema
- Move the slot-ledger test to tests/component_tests/bluetooth_connection
- Comment accuracy fixes (choke-point wording, wrapped lines, backoff note)
J. Nick Koston