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Audit codebase against previous improvement list — all P0/P1/P2 items from the prior review are now resolved or dropped. Restructured document with resolved items in a collapsed section and identified new areas: decoder task duplication, missing tests, decode log error handling, api.rs size, and others. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Signed-off-by: Stan Grams <sjg@haxx.space>