The http and slack targets sent the fixed User-Agent webhooker/1.0. The
delivery engine now takes the version from Globals, the value the web UI
footer shows, and one method builds webhooker/<version> for both
targets. The http target still sets it after the configured headers, so
a configured or inbound User-Agent never reaches the wire.
A test builds the engine through its real constructor with a known
version and checks the header each target sends.
Model: opus-5-5
clawbot