Native DeepSeek Harness (dsh) plugin for SodaMem

Key features

• Every recalled fact names the turn it came from.
• Recall — while a turn is being assembled, the plugin retrieves an evidence block for that turn's question and contributes it to the prompt.
• Do not run both against the same store.
• A SodaMem problem is never a dsh problem.
• This is one line of a real evidence block, verbatim