KarpelesLab / mwsr / 20432073370

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Revert to blocking flush (simpler design)

The write-during-flush feature added too much complexity:
- Required second mutex (cbLk) for callback serialization
- Buffer allocation on every flush
- Subtle race conditions and edge cases
- Tagged as experiment/write-during-flush for reference

This simpler version:
- Holds lock during entire flush (writes block)
- Single mutex, no allocations during flush
- Easier to reason about
- Higher test coverage (89.9% vs 86.3%)

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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