Old clients pinned AgentModeIcon to a closed enum and rendered
undefined for unknown values, crashing the route in production
Hermes with no stack trace. Loosen the type to a plain string,
let the client skip rendering when an icon is unregistered, and
add the customModeIcons capability so the daemon downgrades
non-legacy icons to ShieldCheck for clients that pre-date the
open-string contract.
With capability negotiation in place, the consumer-side tolerance pattern is unnecessary. Drop the dead readDeclaredClientCapabilities helper, inline the parsing in ClientCapabilities.fromHello, delete a tautological assertion in the relay reconnect test, and document the compatibility rules in architecture.md.
Mohamed Boudra