Jacob Magar ac5639301c fix: split subscription_lock, fix safe_get None semantics, validate notification enums ...

P-01: Replace single subscription_lock with two fine-grained locks:
- _task_lock guards active_subscriptions (task lifecycle operations)
- _data_lock guards resource_data (WebSocket message writes and reads)
Eliminates serialization between WebSocket updates and tool reads.

CQ-05: safe_get now preserves explicit None at terminal key.
Uses sentinel _MISSING to distinguish "key absent" (returns default)
from "key=null" (returns None). Fixes conflation that masked
intentional null values from the Unraid API.

SEC-M04: Validate list_type, importance, and notification_type against
known enums before dispatching to GraphQL. Prevents wasting rate-limited
requests on invalid values and avoids leaking schema details in errors.

2026-03-13 02:44:26 -04:00

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