When Yaak moved compression, redirect, and multipart handling out of
reqwest, it started explicitly adding Content-Length as an HTTP header.
Over HTTP/2, hyper also sets content-length internally via DATA frame
sizing, causing a duplicate that HTTP/2 servers (like Node.js) reject
with PROTOCOL_ERROR.
Instead of setting Content-Length as an explicit header, carry the
content length through SendableBody::Stream and use http_body::Body's
size_hint() to let hyper handle it automatically for both HTTP/1.1
and HTTP/2.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Events stream in via model_write listener while also being fetched
from the database. If the DB fetch completed before all events were
persisted, replaceModelsInStore would wipe out events that came in
via model_write.
Added mergeModelsInStore that adds fetched events without removing
existing ones. Applied to HTTP, gRPC, and WebSocket event hooks.
