Adds thumbs up/down buttons next to the copy button on every assistant
message in the VS Code sidebar, and <leader>+/<leader>- keybinds in the
TUI. UI state is in-memory only — ratings reset on reload / session
switch. Persistence can be added later without changing the telemetry
contract.
Events are sent to PostHog via the existing telemetry pipeline. For
Kilo Gateway turns the payload includes session and message IDs so
feedback can be correlated against gateway logs; for direct providers
those IDs are omitted since we cannot correlate them to upstream data.
Josh Lambert
dcaccf3865