simplify compaction algorithm #1417
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The predicate for Live files was returning `*size_exceeded` which meant files could only join a group when combined size ALREADY exceeded the target. Since two small files can never exceed 512 MiB, no groups were ever formed in "Strict Eager Compaction" mode (when eager_compaction_limit >= target_partition_size). Changed to `!*size_exceeded` to match Cold file behavior: files can join a group as long as combined size does NOT exceed the target. This allows accumulating many small files until they reach the target size.
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This a proposal to simplify the compaction algorithm into essentially:
Generation-based compaction for files under cooldown is removed. Eager compaction configuration for recent files is simplified to be purely generation based, replacing the more complex
eager_compaction_limit.