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v2.0.9-rc2

Changes since rc1, based on real field-testing feedback.

Fixed

Fixed leftover empty/duplicate devices after the breaker device-identity fix (serialNumber → id) — a device's identifiers changing makes HA register a new device for the same physical breaker, but the old one wasn't being cleaned up automatically. Now removed automatically on startup once its entities have moved to the new device.
Fixed panel-subentry assignment silently giving up partway through on HA core versions that don't yet support updating an existing device's subentry — previously, hitting this limitation on one device would abort the whole batch, leaving arbitrary devices/entities unsorted depending on iteration order rather than just the ones actually affected. Each device/entity is now handled independently.
Downgraded the "doesn't support config_subentry_id" log lines from warning to debug — this is a known, permanent-until-HA-updates condition on some HA core versions (not something actionable), and was repeating on every single restart.
Fixed the residence picker ("Select Residence(s)" dialog) crashing with expected str for dictionary value for some accounts — Leviton's API returns residence id as a number for at least one endpoint; now coerced to a string consistently, matching every other id in the integration.
Config flow: a legitimate "already configured" abort during the 2FA step could get swallowed by an overly broad exception handler and misreported as a generic "unknown error."