This is a multi-agent coding workflow. Using the supplied plans, prompts, tool-call traces, workspace diffs, task ownership, handoff messages, and result artifacts, create a bounded test matrix. Include independent agents on the same task; concurrent work in an approved sandboxed repository; stale, duplicated, or malformed handoffs; interruption and retry; incompatible assumptions; budget exhaustion; and an unexpected workspace change. For each scenario, state the participants, allowed writes, schedule, invariant, expected evidence, containment, cleanup, and verdict rule. Execute only approved sandbox scenarios. Label every unexercised scenario as **NOT ASSESSED** rather than inferring a pass.