replace celery State with lightweight uuid to name cache

[tulioz]

celerymon only needs task name from the State object, this replaces the full celery State (10k Task objects with 30+ fields, Worker objects, WeakSets, taskheap, mutex) with a simple OrderedDict mapping uuid to task name

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Stack

1. #20 add reconnection logic to event watcher thread (merged)
2. 👉 #21 replace celery State with lightweight uuid to name cache 👈 (this pr)

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[tulioz]

/gemini review

[gemini-code-assist]

Code Review

This pull request replaces Celery's internal state tracking with a custom OrderedDict-based cache for task names in the EventWatcher class. Feedback suggests refactoring the hardcoded cache limit into a class-level constant and using the move_to_end method for more idiomatic cache management.

[tulioz]

/gemini review

[gemini-code-assist]

Code Review

This pull request replaces the dependency on Celery's internal state management with a custom LRU cache using an OrderedDict to map task UUIDs to names. This change simplifies the EventWatcher initialization and introduces a configurable cache limit to manage memory usage. Review feedback suggests optimizing the cache update logic by using move_to_end to properly refresh the LRU position for all task events and ensuring that the retrieved task name is never null to maintain compatibility with Prometheus labels.