1.0.0 - Schedule Guardian and held-connection policy

Fork of MrMooreUK/fluvalble hardened for a single classic AquaSky-family light behind ESPHome Bluetooth proxies: Schedule Guardian (mode/clock/schedule drift detection and correction, problem sensor + repairs issue, timed manual overrides), Bluetooth Connection switch (hold_connection), advertisement-triggered reconnect with jittered backoff, clock sync on every connect, mode-aware writes, confirmed classic writes. 760 tests.