Add NoHousingRegion child regions for Britain vendor shops on both
facets, following the existing New Haven/Haven shop pattern. Each shop
type (bakery, blacksmith, tailor, mage, bank, etc.) resolves to its own
region nested under the Britain TownRegion instead of only the broad
town region. Taverns/inns are intentionally excluded as they already
have dedicated NoLogoutDelay regions.
Refs #1052
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
b9cd4fd86e