upgradeSword() and upgradeArmour() were near-identical: the only differences
were the AB-tech key prefix ('b' vs 'a'), the building type whose level gates
the research (Smithy 12 vs Armoury 13) and the matching bid building data
($bid12 vs $bid13). Merge them into a single upgradeWeaponOrArmour($get, $type)
parameterised by the prefix, deriving the building type from it, and route both
procTechno() cases through it. Resolves the pre-existing //TODO. Behaviour-
preserving.
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Ferywir
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