Add DCO sign-offs to all commits

Rebased all commits to include "Signed-off-by" lines as required by the DCO.

Signed-off-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

Co-authored-by: jsturtevant <648372+jsturtevant@users.noreply.github.com>

Author: Copilot