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Source catalogue and selection release.
- Adds classified provider inventory with domains, content kinds, access classes, aliases, source/view identity, and default aggregate membership.
- Adds layered search.selection policies while keeping hard provider enablement separate from platform=all.
- Expands the official search catalogue to 23 published entries (21 independent sources and 2 source-backed views).
- Adds provider inventory/status diagnostics and explicit alias selection.
- Updates configuration examples and provider credential guidance.
Verified by the complete GitHub release gate on Ubuntu and Windows, official compatibility probes for all 23 published provider packages, and live searches against public academic sources.