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04 — Bid Placement (Happy Path)

Sequence diagram: a bidder placing their first bid on an auction. The increase / supersede flow lives in 04-bid-increase.md.

The API authenticates a bid and verifies creative approval. AuctionDO validates and records it, calculates rank and optionally extends the closing time. The bidder receives confirmation while WebSocket clients receive a batched update.The API authenticates a bid and verifies creative approval. AuctionDO validates and records it, calculates rank and optionally extends the closing time. The bidder receives confirmation while WebSocket clients receive a batched update.