cow: retire the legacy cow-api host cone#471
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Delete shepherd-cow-host, the shepherd:cow legacy worlds (cow-api, cow-ext, shepherd; cow-events stays as the event-ABI package of record), the shepherd-sdk cow surface, and the shepherd-sdk-test mocks. The shepherd binary composes the core lattice with the videre platform alone. The keeper sweep moves to composable-cow behind the sweep slice; stop-loss migrates onto #[videre_sdk::keeper] and pool submit through the typed CowClient, keyed on the venue-and-body intent-id. twap gates topic-0 on the sol decoder pinned against cow-events; the WIT layering gate moves to cow-venue. ADR-0005/0006 marked superseded.
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What
Deletes the legacy
shepherd-cow-hostextension, theshepherd:cowlegacy WIT worlds (cow-api,cow-ext,shepherd;cow-eventsstays as the event-ABI package of record), theshepherd-sdkcow client cone, andshepherd-sdk-testmocks. Adds asweepslice tocomposable-cow(poll-loop composition over the typedcow-venueclient onvidere:venue/client) and moves stop-loss onto#[videre_sdk::keeper]+ pool submit, keyed on the venue-and-body intent-id. twap gates topic-0 on the sol decoder pinned againstcow-events. Adds a WIT layering gate incow-venueasserting no generic package referencesshepherd:cow. Marks ADR-0005/0006 superseded.Why
Closes out the CoW-on-videre split for M4: the submit/status path is now served entirely by the
cow-venueadapter over the pool, so the interim host-sidecow-apishim is dead weight per the videre-split-plan §4 (the R2 category error resolution and the clean adapter/keeper re-split).Testing
cargo fmt --all --checkcargo check --workspace --all-featurescargo clippy --workspace --all-targets --all-features -- -D warningscargo nextest run --workspace --all-features --no-fail-fastcargo test --docAI Assistance
Implemented with Claude Code assistance; reviewed and gated by mfw78.
Closes #293