Function create_trajectory 

pub fn create_trajectory(
    path: &Path,
    target_findings: Vec<String>,
    deposited_by: &str,
    notes: &str,
    reason: &str,
) -> Result<StateCommandReport, String>

v0.50: Open a new Trajectory and emit a trajectory.created canonical event. Returns the new vtr_* id in the report’s finding_id field (the StateCommandReport schema reuses that field for the primary mutated object id).

Steps are appended via append_trajectory_step rather than supplied at creation — that keeps the search visible to readers as it unfolds rather than only after the fact.