Function: transitionToYieldMode()

This function is an admin-controlled state change that closes the Deposit phase and enables the Yield phase. It requires the configured deposit window to have ended.

Branches and code coverage

Intended branches

• Update the _mode to OperationalMode.Yield.

  Test coverage

Negative behavior

• Non-admin callers, or calls outside Deposit mode or after the deposit window ends, revert.

  Negative test

Function call analysis

• None.