feat: remove remaining lint warnings in event bus and ring buffer

[remcostoeten]

Summary\n- removed non-null assertion from event bus unsubscribe path by capturing a stable listener bucket\n- replaced ring buffer

ew Array(capacity) allocation with typed Array.from initialization\n- preserved existing runtime behavior while eliminating remaining lint warnings\n\n## Validation\n- bun run check\n\n## Notes\n- this implements the quick win from o_implement.md under lint cleanup

Summary by CodeRabbit

• Refactor
  • Internal code structure improvements to event subscription and performance logging systems.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Two modules refactored for improved implementation patterns. The event bus subscribe function now uses a named bucket alias for Set operations, while the performance logger replaces its buffer with a nullable variant and adds filtering logic to sanitize results.

Changes

Cohort / File(s)	Summary
Event Bus Refactoring src/core/eventBus.ts	Renamed direct Set usage to a bucket alias in the subscribe function. Set operations (add, delete) now accessed through the bucket variable, improving code clarity without altering functionality or public API.
Logger Buffer Nullability src/domains/performance/logger.ts	Changed buffer from PerfEvent[] to (PerfEvent | null)[] initialized with nulls. Added notNull type guard and filtering logic to exclude null entries in getAll() results for both full and partial buffer states.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~22 minutes

Poem

🐰 A bucket of events, now clearly named,
No nulls shall slip through our logger's frame,
With guards in place and filters true,
The code flows clean—both old and new! ✨

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