feat(dispatch): slice 5.3 CandidatesSelected + NoCandidatesAvailable#34
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erikshafer
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Jun 17, 2026
…and next-session candidate Captures session close after PR #34 squash-merge (`bda8363`). Documents slice 5.3 deliverables (CandidatesSelected automation with marker-interface outcome, RequestRoundsProjection, INearbyAvailableDriversSource stub, 3 Alba tests), current repo state (11 passing tests, clean working tree), and verified knowledge (`[WriteAggregate]` on non-first stream event confirmed working, extend-chain test updates established as in-scope). Flags skill-file debt at encoding threshold: marker-interface union return pattern and event-triggered automation shape both hit 3 instances—queue for `tidy: skills` PR before slice 5.4. Carries housekeeping items from retro 004/005. Nominates slice 5.4 (OfferSent fan-out) as next candidate with alternative to encode skills first. Notes Marten 9/Wolverine 6 migration incompleteness. Updates artifacts inventory to 11 tests across 3 slices.
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Summary
CandidateSelectionAutomationreacts toFareQuoted, queriesINearbyAvailableDriversSource(stub seam; transport deferred to parking-lot Add Dispatch business-event protobuf contracts #4), and emitsCandidatesSelected(≥1 eligible candidate, top N by inverse-distance match score) orNoCandidatesAvailable(NoDriversInRange/NoCapableDriversInRange)DispatchPolicySnapshotDI record (hardcoded defaults; Slice 11 swaps forDispatchPolicyConfigured-fed projection),ICandidateSelectionOutcomemarker interface (third occurrence of the pattern), andRequestRoundsProjectioninline projection (consumed by Slice 9 re-dispatch)[WriteAggregate]bound to a non-first stream event (FareQuotedis the second event on the stream); verified against Wolverine 5.37 source — attribute is trigger-agnosticTest plan
candidates_selected_picks_top_five_ordered_by_match_score,no_drivers_in_range_emits_no_candidates_with_no_drivers_reason,accessible_request_with_only_standard_drivers_emits_no_capable_drivers_reasonFareQuotedRequestRoundsProjectionis declaredpartial(Marten 9 source-gen requirement)[WriteAggregate]bound toFareQuoted.RideRequestIdloadsRideRequestcorrectly from a 2-event stream## Document Historyv0.2 entry + W001## Document Historyv0.7 entry