View: Usage sites (parser functions)

[alistair3149]

Result of planning session with @alistair3149.
Context: the NeoWiki codebase and ADR 018 (Views).
_{Written by Claude Code, Opus 4.6}

Summary

Allow specifying which View to use from wikitext. Usage sites (parser functions, Page Schemas, etc.) specify which
View to use when displaying a Subject (ADR 018).

Dependencies

• View: Render Subjects using Display Rules #660 (View rendering with Display Rules)

Scope

• Add a way to reference a View by name from wikitext (e.g., parser function parameter)
• Look up the View via ViewLookup and pass it to the rendering layer
• Handle missing/invalid View references gracefully (fall back to default display)