Function land 

pub fn land(
    target: &Held,
    recorded: Option<&Manifest>,
    prepared: &Prepared,
    origin: Origin,
    _lock: &TargetLock,
) -> Result<Landed, RkError>

Land prepared into target.

Refuse every collision first, open the target once under the lock the caller holds, write the configuration where its bytes changed, then each candidate by its decision, then the receipt.

The caller gathers under the same lock where it wants the evidence and the writes to agree; prepare itself takes none, so a preview holds nothing.

Errors

The collision refusal at exit 73 with nothing written; the lock’s refusals; and RkError::Io for a write that fails, naming every path completed before it, with the previous receipt left in place.