82c95908fe
The plan of record ships concurrency caps (per-task total, per-key limit) and leaves the fair-selection scoring untouched, the opposite lever from the earlier spike's SFQ recommendation. Adds the reconciliation design and the queueing-theory research grounding it (WFQ/SFQ wait bounds, concurrency-cap fairness limits, CoDel scope, real multi-tenant systems, Little's law).