Milestone-A second capability: chain whole topology runs in sequence, threading each stage's final output into the next stage's task (e.g. swarm brainstorm → hierarchical execute → debate review). Each stage is a full safe topology run, so §15 holds at every step. WorkflowRecord aggregates per-stage RunRecords + totals. Demonstrated in the benchmark example. 14 tests; clippy clean. Co-Authored-By: Claude Opus 4.8 <[email protected]>