plugin-redis-traced

Measures a full traced redis command end to end: the real tracer and the real redis plugin run bindStart (meta build), span start, context entry via the start channel's runStores, span finish, and the processor — the integrated per-command cost the isolated plugin-redis bench omits by stubbing startSpan. The processor erases each trace on finish, so spans are built and finished but nothing is encoded or sent off-process.