docs: add worker improvements implementation plan

7-task plan covering double-upload fix (hash lock + two-phase write),
parallel account ingestion (per-key mutex), and Premium 4GB upload
limit with automatic detection.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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2026-05-02 22:47:52 +02:00
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commit 61e61d0085

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