v0.8.0 — Auction extension

Added — Auction extension

Process-layer objects Auction (a profile of the sourcing flow; reverse / english / dutch / sealed-bid / multi-criteria via auctionType + deterministic rules) and Bid.

The auction rules and canonical bid record are normative and operator-independent — any conformant operator closing the same bids under the same rules MUST reach the same Award. The close reuses Decision/Award; eligibility ties to SupplierQualification; the bid history is a hash-chained Event trail. Open auctionType codelist; reverse-auction worked example. Modelled on Prozorro's neutral-core architecture: price formation in the standard, UX in the operators.

Includes auction/ demo (deterministic bidding agents + auctioneer, runner, conformance-verified).