Refresh host skill catalogs through world state - #33425
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## Why Host skills can change after a thread starts. Subsequent turns need the updated catalog without reinjecting an unchanged catalog on every turn. ## What changed - Register the host skill provider in app-server and project its catalog through a dedicated World State section. - Render host skills with the existing metadata budget and usage instructions, including skill-root aliases when available. - Suppress the legacy host catalog and contextual fragment when World State owns the catalog, while preserving host skills for explicit and shadow selection. ## Testing Added an app-server test that installs a host skill at runtime and verifies the catalog updates once and remains stable on the following turn. GitOrigin-RevId: 4cacc6b2258fc3cab8499fbdf9aa6ab0324ec10d
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Refresh host skill catalogs through world state
Why
Host skills can change after a thread starts. Subsequent turns need the updated
catalog without reinjecting an unchanged catalog on every turn.
What changed
a dedicated World State section.
including skill-root aliases when available.
the catalog, while preserving host skills for explicit and shadow selection.
Testing
Added an app-server test that installs a host skill at runtime and verifies the
catalog updates once and remains stable on the following turn.