Add reads field to UseCaseManifest, update CLAUDE.md with Q0-Q3 rules,
add ./reader subpath to AGENTS.md exports table, and cascade reader
conventions through conformance quickref, adding-a-feature guide, and
scaffolding guide. Moves gen reader from deferred to planned.
Introduce readers as a fourth cross-feature mechanism alongside events,
jobs, and realtime. Readers solve synchronous domain queries across
verticals (e.g. permission checks) where Payload relationTo gives raw
data but the answer requires business-rule evaluation by the owning
feature.
- Define rules Q0-Q3 (query-only, contract public, read-only, no cycles)
- Reader wraps existing use cases via ReadOnly<F> brand enforcement
- Lives under integrations/readers/ with ./reader export subpath
- Manifest reads: ["auth"] field for conformance gate visibility
- Update glossary with Reader, reads, ReadOnly<F> terms
