release: 3.19.3

feat: Replace default model used in server-v3 api spec examples

chore: update docs for api:"required"

chore(ci): support opting out of skipping builds on metadata-only commits

feat(internal): support comma format in multipart form encoding

chore: remove unnecessary error check for url parsing

fix: prevent duplicate ? in query params

chore(client): fix multipart serialisation of Default() fields

chore(internal): support default value struct tag

release: 3.18.0

chore(ci): skip lint on metadata-only changes

feat: Include LLM headers in ModelConfig

feat: Add explicit SSE event names for local v3 streaming

chore(internal): update gitignore

feat: variables for observe