- Re-read messages from SDK after injectTextPartAsync to prevent stale
snapshot from causing duplicate placeholder injection (P2)
- Replace local isRecord with shared import from record-type-guard (P3)
The previous commit incorrectly removed this function and its test
as dead code. While the local implementations in other files have
different return types (MessageData[], MessagePart[]) and cannot be
replaced by this shared version, the function is a valid tested
utility. Deleting tests is an anti-pattern in this project.
- Encode path segments with encodeURIComponent in HTTP API URLs
to prevent broken requests when IDs contain special characters
- Remove unused readMessagesFromSDK from messages-reader.ts
(production callers use local implementations; dead code)
