Enforce Genarrative play-type SOP and update docs

Rewrite Genarrative play-type integration guidance across .codex and .hermes to define a platform-level SOP: default to form/image workbench, unify single-image asset slots (CreativeImageInputPanel), standardize series-material sheet->cut->transparent->OSS pipeline, and forbid copying legacy chat/agent workflows as the default. Add decision-log entry freezing the SOP and a pitfalls note warning against direct reuse of old play tools. Update CONTEXT.md and docs/README.md, add a new PRD file, and apply related small server-side changes (module-auth, spacetime-client mappers and runtime) to align back-end code with the new contracts and flows.

server-rs/crates/module-auth/src/lib.rs

@@ -2061,7 +2061,6 @@ fn map_sms_provider_error_to_phone_error(error: SmsProviderError) -> PhoneAuthEr
         SmsProviderError::InvalidConfig(message) => {
             PhoneAuthError::SmsProviderInvalidConfig(message)
         }
-        SmsProviderError::InvalidVerifyCode => PhoneAuthError::InvalidVerifyCode,
         SmsProviderError::Upstream(message) => PhoneAuthError::SmsProviderUpstream(message),
     }
 }