ADR-0034's nearby-postcode broadening degrades to a genuine
NoSameTypeComparablesError whenever the default 1000m/30-postcode reach has no
same-type comparable nearby (e.g. property_id=752685, portfolio 824 — the only
Maisonette within reach). Adds one configurable extra widening step
(EpcComparablePropertiesRepository.candidates_near now accepts
widen_nearby_postcodes), tried only when the normal-radius walk falls short of
`minimum` matches. modelling_e2e's handler wires this to a 3000m/60-postcode
PostcodesIoClient as the single wider step.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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