Oracle Price Aggregation

Computes the aggregate price a decentralized oracle network would publish from a set of individual submissions, under four mechanism-named aggregation rules: median-filtered confidence-weighted mean, stake-weighted median on the frequency convention, three-vote confidence median, and plain median with an f-of-n readout. Supports an optional prev_print_hash citing the prior print of the same pair, which turns a series of same-pair prints into a walkable chain; omitting it reproduces the unlinked-print output byte for byte. Every price, weight, confidence, timestamp and submitter id is supplied and asserted, never fetched (zero-egress). Simulates the aggregation step only, does not model the commit-reveal phase, and never claims any real network did or would publish this number. A submitter id may be supplied as a sha256-salted@1 commitment (SPEC.md §25) to withhold the identifier while keeping the aggregation bound to it. Not a price feed and not a market-data source.

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