feat: runnable cascade demo over production-shaped logs#45
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The README's cascade-config section promised commands no fresh clone could run: no classmesh.yaml existed anywhere in the repo. This ships the whole demo.
examples/genprod.go writes production-shaped logs (access lines, probes, app chatter, payments, auth events, warns, errors, and a slice nothing recognizes; deterministic by seed). examples/classmesh.yaml declares a two-tier cascade over them: rules (gate 1.0) decide 88%, a gated mock model tier (0.7) takes the warns, review.jsonl collects the 6% neither tier can decide, and health-check noise is dropped by route. With the default seed, 1M lines classify in under two seconds: processed=1000000 classified=940162 review=59838.
An end-to-end table-driven test copies the example config to a temp dir and pins per-record category, deciding stage, drop suppression, and review routing, so the committed example stays runnable.
Folded from pre-PR review: make bench now covers classifier, schema, and logfields; the pipeline bench row states its discard sink; the wordpiece package doc no longer promises an unshipped model stage; README and docs/architecture.md stop claiming only text and stdin implement Source (the jsonl source shipped in #18); the cascade-config commands point at the shipped example; demo artifacts are gitignored.