eviction: fix LFU tie-breaking with LRU-on-ties using monotonic seq; …

[hyp3rd]

…remove ARC from default registry; docs: mark ARC experimental and list algorithm names; minor readme typo; middleware: tidy comments

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[Copilot]

Pull Request Overview

This pull request improves the LFU eviction algorithm's tie-breaking mechanism and updates documentation to clarify algorithm availability. The primary change implements proper LRU-on-ties behavior for the LFU algorithm using a monotonic sequence counter, while also removing the experimental ARC algorithm from the default registry and improving documentation clarity.

• Fixes LFU tie-breaking to use LRU ordering instead of insertion order
• Removes ARC from default algorithm registry and marks it as experimental
• Updates documentation to list available algorithm names and corrects a typo

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pkg/eviction/lfu.go	Implements monotonic sequence tracking for proper LRU tie-breaking in LFU algorithm
pkg/eviction/eviction.go	Removes ARC algorithm from default registry
config.go	Updates package documentation to mark ARC as experimental and remove it from default list
README.md	Adds algorithm names section, marks ARC as experimental, and fixes "Evitc" typo
pkg/middleware/otel_metrics.go	Removes obsolete comments about function ordering

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[Copilot]

Initializing seq to 0 creates a potential issue where the first access will have sequence 1, but tie-breaking logic expects higher values to be more recent. Consider starting from 1 or documenting that 0 represents uninitialized state.

Suggested change

	seq: 0,
	seq: 1,