feat(core): re-export InitialHistory from conversation_manager (#3270)

This commit adds a re-export for InitialHistory from the internal
conversation_manager module in codex-core's lib.rs.

The `RolloutRecorder::get_rollout_history` method (exposed via `pub use
rollout::RolloutRecorder;`, already present in lib.rs) returns an
`InitialHistory` type, which is defined in the private
conversation_manager module. Without this re-export, consumers of the
public RolloutRecorder API would not be able to directly use the return
type, as they cannot access the private module. This would result in an
inconvenient experience where the method's return value cannot be
handled without additional, non-obvious imports.

By adding `pub use conversation_manager::InitialHistory;`, we make
InitialHistory available as `codex_core::InitialHistory`, improving API
ergonomics for users of the rollout functionality while keeping the
conversation_manager module internal.

No functional changes are made; this is a pure re-export for better
usability.

Signed-off-by: M4n5ter <m4n5terrr@gmail.com>

codex-rs/core/src/lib.rs

@@ -43,6 +43,7 @@ pub use model_provider_info::create_oss_provider_with_base_url;
 mod conversation_manager;
 mod event_mapping;
 pub use conversation_manager::ConversationManager;
+pub use conversation_manager::InitialHistory;
 pub use conversation_manager::NewConversation;
 // Re-export common auth types for workspace consumers
 pub use auth::AuthManager;