Crawl progress traces — the operator should watch didi work, not stare at an ellipsis

[mpstaton]

Context:

• Crawl-Progress-Is-A-Black-Box-Needs-Traces-The-Operator-Can-Watch.md

The web-search narration already arrives in the Anthropic response and is discarded by extractText. Pipe it: prompt-runner publishes organization.crawl.progress frames over NATS → workspace forwards as WS event frames → search-and-add (and later the chat rail) renders a rolling trace under the crawl bar.