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]>