The event-model commit picked up its build directory because there was
no gitignore entry for it -- server/target/ is listed explicitly rather
than a blanket target/, and the new crates need the same line each.
Co-Authored-By: Claude Sonnet <noreply@anthropic.com>
RUST.md's recommendation item 1 starts here: Event, QuestionOption,
SessionStatus, ImageRef, AttachmentRef, SeqEvent, context_tokens and
context_after move to a new event-model crate so a future Rust client
shares one definition with server/ instead of Events.kt's hand-kept
mirror. session/driver.rs and session/transcript.rs re-export
everything they used to define, so nothing downstream of either
module changed.
cargo test (127 passed), clippy --all-targets and fmt clean in both
server/ and event-model/.
Co-Authored-By: Claude Sonnet <noreply@anthropic.com>