summary

• replace v2 session message sync decoding with effectful typed decode failures
• map corrupt projected messages on v2 message/context reads to safe UnknownError responses with refs
• add runtime and OpenAPI coverage for v2 session read data errors

testing

• bun test test/server/httpapi-session.test.ts test/server/httpapi-public-openapi.test.ts
• bun typecheck
• bun test ./test/server/httpapi-exercise/index.ts
• bun turbo typecheck