Function launch_session 

pub fn launch_session(
    staged: StagedSession,
    on_url: impl FnOnce(&str),
) -> Result<LaunchResult, RuntimeError>

Instantiates the staged capsule and executes it.

Agent capsules (inference configured) run the built-in Rust agent loop. Script capsules (WASM component present) instantiate and call murmur:capsule/run#run().

Leaves the process’s SIGTERM disposition alone: a caller that runs several sessions in one process, or does more work after this returns, keeps the default of ending at once. A caller whose process is the session uses launch_session_handling_sigterm instead.