Town Zoning

cmclient town zoning port (Batch 4, commit 9e3f95a2). The jrpm base (pulsexlb) already has its own zoning system (toolbar + drawing pipeline + menu). This batch adds cmclient's unique evaluation modes and growth_tiles save on top of it.

New Modes (zoning toolbar dropdown)

Mode	Description	Coloring
Town zones (Tz)	Town concentric zoning, reuses squared_town_zone_radius	Tz0 edge=light blue / Tz1=red / Tz2=yellow / Tz3=green / Tz4 city center=white
Town growth tiles	Current month/previous month house construction and demolition traces	New house=green / Demolished=light blue / Rebuilt=white / Skipped growth=orange / Skipped build=yellow / Server demolished=red

growth_tiles Data Layer (cm_town_growth.cpp/.h)

• Two rolling month maps: TileIndex → TownGrowthTileState (current month / previous month)
• Event hooks:
  • BuildTownHouse → NEW_HOUSE (upgraded to RH_REBUILT if previous month was demolished)
  • ClearTownHouse → RH_REMOVED
  • TownsMonthlyLoop → monthly rotation (previous month = current month, current month cleared)
• Save persistence: New GRWT savegame chunk (misc_sl.cpp), serialized as a list of {tile, state} pairs; old saves without this chunk load fully compatible (verified save→load round-trip).

How to Open

Toolbar menu → Map (Zoning) → Open zoning toolbar, inner and outer ring dropdowns select evaluation modes.

Trim Notes

cmclient's CityBuilder server-specific modes (CB acceptance zone / CB town limit) and ext::Town extension fields (advertising, funds, cargo statistics) are server gameplay-specific and were not ported.