- Hoist ODOH_CONTENT_TYPE to a single pub(crate) constant in odoh.rs;
relay.rs imports it instead of declaring its own.
- Generalize dashboard encryptionPct(data, encryptedKeys, allKeys)
so both Inbound Wire and Outbound Wire panels share the same math
instead of drifting independently.
- Extract RelayState::new() and build_app() helpers in relay.rs so
the test spawn_relay() and production run() wire the same router
+ body-limit layer. Prevents future middleware from landing in one
path but not the other.
All 344 lib tests pass; no behavior change.
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