TECH-6 · Trust graduation per namespace (Unleash flags)

> Product/tech item from the dimensional diagnosis (**2026-07-03, v2**, section C).

### Finding
Namespaces need editorial safety before publishing publicly; Unleash feature flags already exist.

### Action
**Trust graduation per namespace**: a new namespace publishes internally and earns public publication after consistent quality. Enables safely activating the 10 hubs. *(Channels)*

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- **Priority:** 🟡 Medium
- **Epic:** #2503

The issue names no files, tests, or entry points. Start by reading epic #2503 and the existing Unleash feature-flag configuration; done means namespaces can publish internally, earn public publication through consistent quality, and support safely activating the 10 hubs.

索引モデルが issue の本文から書いたものです。