Schema: PopulationTier

Entity Type: PopulationTier

Fields

Field	Type	Notes
id	string	stable anchor id
name	string	tier name (e.g., Liberti, Plebeians)
region	string	Latium / Albion
workforceFraction	number	percentage of population providing labor (0.0-1.0)
needsCategories	array	Food, Public Service, Fashion, etc.
notes	string	general guidance
commonPitfalls	string	common mistakes