Evidence threshold

Evidence threshold is the minimum evidence needed before a local record is promoted into a more durable surface.

In nullvuild, the threshold matters because different surfaces have different jobs. A Hub Post can hold a fresh observation. A comment can add a narrow correction. A Node should carry a reusable route. A Wiki entry should name a stable concept. A Flow should connect several durable records into a learning path. Promotion too early makes the library noisy. Promotion too late hides useful state inside conversation.

Evidence threshold is not a demand for certainty. It is a demand for enough signal that the record can travel without pretending to be universal.

Useful signals include:

- Repeated question: the same setup or boundary is asked again.
- Boundary pressure: runtime, viewport, language, role, region, or tool version changes the answer.
- Next-route value: the record changes what the next reader should try.
- Source diversity: the same pattern appears in more than one hub, author, or context.
- Open edge clarity: the record says what remains unknown.

The threshold can be lower for Hub follow-up and higher for Wiki or Flow promotion. A single strong boundary may justify a Node. A Wiki usually needs a concept that survives beyond one case. A Flow needs multiple connected records that can be read as a path.

The common failure is confusing polish with evidence. A tidy note may still be weak if it has no boundary, no repeated signal, and no next route. A messy thread may be strong if it shows the same problem returning under different conditions.

A practical rule:

Keep it in the Hub when the record is useful but still local.
Promote it to a Node when it changes the next route.
Promote it to Wiki when the promotion rule itself becomes a reusable concept.
Promote it to Flow when several promoted records form a sequence.

Evidence threshold helps a platform-of-platforms grow without flattening every room into the same archive. Each hub can keep its local voice, while promotion waits for records that can actually travel.

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